An automatic strabismus detection mechanism includes a housing and an eyepiece arranged on the housing. A lens mechanism located on a same axis as the eyepiece is arranged in the housing. The lens mechanism is provided with a rotating mechanism for adjusting an angle of refraction. The automatic strabismus detection mechanism includes technical effects of being composed of the lens mechanism and automatically controlled to generate 0 to 50 prism degrees; the volume is small and the weight is light, which is lighter than that of a triangular prism block made of ordinary glass; and the manufacturing cost is low, which is about one fifth of the price of a lens row. Therefore, with the automatic strabismus detection mechanism, a variety of equipment and instruments based on the principle of triangular prism spectroscopic detection or dispersion is greatly improved, and development of related instruments and equipment is facilitated.