The application belongs to the field of material loading and unloading, and specifically relates to a vehicle-mounted mechanical arm applied to unmanned self-loading and unloading scenes of a transport vehicle (or other carriers). The vehicle-mounted mechanical arm comprises a translation mechanism, a turnover telescopic mechanism, a movable support arm and a mechanical hand
assembly. The translation mechanism comprises a bottom plate and slide rails arranged on the upper surface of the bottom plate. The movable support arm comprises two
upper arms arranged in parallel and two front arms arranged in parallel. The two
upper arms are respectively in sliding fit with the slide rails on the two sides of the upper surface of the bottom plate and can translate along the slide rails. The
upper arms are connected with the front arms through the turnover telescopic mechanism and a telescopic rod. The two ends of the telescopic rod are respectively connected with the upper arms and the front arms, and the telescopic rod can rotate around the connection position with the upper arms. A lifting and translating mechanism capable of moving up and down along the front arms and self-rotating around the rotation shaft of the front arms is arranged between the two front arms. The front arms can be turned over to the upper side or the front side of the upper arms under the
joint action of the turnover telescopic mechanism and the telescopic rod.