1. A method for evaluating cervical spine proprioception, comprising: step 1, wearing a forehead band (1) on a head of a subject, to locate a posture detection part (4) at an inner side of the forehead band (1) and on a forehead of the subject, and make an eye mask (5) on the forehead band (1) cover eyes of the subject, wherein the posture detection part (4) comprises a posture sensor, and the posture sensor is configured for connecting to a data terminal (9) in a wired or wireless manner;

step 2, starting, by an operator, the data terminal (9) to connect the data terminal (9) to the posture detection part (4), wherein the data terminal (9) is a computer or a mobile phone;

step 3, performing, by the subject, one head movement under a target movement posture at prompt of the detector operator;

step 4, operating, by the operator, the data terminal (9) to record an angle value of the one head movement under the target movement posture from the posture detection part (4); performing, by the subject, at least one head movement under the target movement posture under prompt of the operator, to thereby complete a plurality of head movements under the target movement posture, wherein the plurality of head movements under the target movement posture includes the one head movement under the target movement posture and the at least one head movement under the target movement posture, a total number of the plurality of head movements under the target movement posture is at least two; and operating, by the operator, the data terminal (9) to record an angle value of each of the at least one head movements under the target movement posture from the posture detection part (4);

step 5, changing, by the subject, the target movement posture, and repeating the step 3 and the step 4 to complete a plurality of target movement postures, wherein the plurality of target movement postures comprise at least two of a forward flexion posture, a backward extension posture, a left rotation posture, a right rotation posture, a left flexion posture, or a right flexion posture;

step 6, operating, by the operator, the data terminal (9), thereby, taking, by the data terminal (9), the one head movement performed in the step 3 under each target movement posture of the plurality of target movement postures as a reference, calculate an angle difference between each of the plurality of head movements under each target movement posture of the plurality of target movement postures and the one head movement performed in the step 3 under each target movement posture of the plurality of target movement postures to thereby obtain angle differences under each target movement posture of the plurality of target movement postures, and averaging, by the data terminal (9), the angle differences to obtain an average angle difference under each target movement posture of the plurality of target movement postures; wherein a formula for averaging the angle differences is as follows:

a = \frac{❘ θ_{n} - θ_{1} ❘ + ❘ θ_{n - 1} - θ_{1} ❘ + \dots + ❘ θ_{n - (n - 1)} - θ_{1} ❘}{n - 1}

where a represents the average angle difference under each target movement posture of the plurality of target movement postures, n represents the total number of the plurality of head movements under the target movement posture, and θ represents an angle value measured by the posture detection part (4);

step 7, operating, by the operator, the data terminal (9) to calculate a resultant average angle difference under the plurality of movement postures; wherein a formula for calculating the resultant average angle difference is as follows:

y = \frac{a_{1} + a_{2} + \dots + a_{p}}{p}

where y represents the resultant average angle difference, p represents a total number of the plurality of movement postures, a₁represents an average angle difference under a first target movement posture of the plurality of target movement postures, a₂represents an average angle difference under a second target movement posture of the plurality of target movement postures, and a_prepresents an average angle difference under a p-th target movement posture of the plurality of target movement postures; and

step 8, operating, by the operator, the data terminal (9), thereby, comparing, by the data terminal (9), the resultant average angle difference with a standard value, and evaluating, by the data terminal (9), cervical spine proprioception of the subject based on a difference between the resultant average angle difference and the standard value.