Hanger parallelism detection device

The invention relates to a hanger parallelism detection device, which is used for detecting the parallelism of a left lifting lug and a right lifting lug on an air-to-ground missile launching device, and comprises a maintenance platform for placing the launching device, a base, a laser range finder, a gradienter and a clamping device, the clamping device comprises a threaded hole formed in the base, a screw in threaded connection with the threaded hole, a spring with one end abutting against the screw and a positioning ball fixedly connected with the other end of the spring. The laser range finder has the beneficial effects that the laser range finder firstly measures the distance from the left lifting lug to the laser range finder by using an axial ray projection method, then rotates the laser range finder by 180 degrees by taking the rotating shaft as the center, and then measures the distance from the laser range finder to the right lifting lug; the center distance between the two lifting lugs is obtained