The invention discloses a strabismus angle measuring device. The device comprises a measuring part and a coordinate part. The measuring part comprises a measuring support. The top of the measuring support is provided with a measuring board. Observation through holes are arranged in the measuring board and provided with baffle plates which can be opened and closed. The measuring board is provided with calibrating drums through movable pairs in a penetrating mode. The calibrating drums can rotate and swing with the movable pairs as supporting points. The coordinate part comprises a coordinate board. A coordinate field is formed between the measuring board and the coordinate board and is characterized by taking the geometric center of the measuring board as the original point, taking a horizontal surface as an xy plane, and taking a vertical surface as an xz plane with coordinate points known relative to the angle of deflection for the original point. The strabismus angle measuring device has following beneficial effects: a sight drum of the measuring board is utilized so that a tester can observe multiple coordinate points in the coordinate field more accurately through the observation angles and by guiding of the sight drum; and therefore, the tester can more concentrate on the coordinate points and multiple surrounding factors are prevented from affecting measuring results.