This paper proposes a method based on binocular stereo vision detection, which can implement the auto airbag assembly precision of the measurement and evaluation. It combines the image of the airbag under test which is provided by the CCD camera with three dimensional mathematical model of standard airbags, establishes the position tolerances Vx,Vy,Vz of the car airbag contour detection points, and the shape tolerances K of the points on the contour curve segment is as evaluation indexes of assembly precision parameters, which can complete contour parameters automatically and determine whether the airbag under test qualified. The actual verification results show that, the assembly quality indexes and methods of stereo vision airbag assembly accuracy of the evaluation can evaluate the assembled quality of the airbag quickly and accurately.