Automatic assembling device

The invention provides an automatic assembling device which is used for assembling a part to a workpiece located in a fixing jig. The automatic assembling device comprises a moving mechanism, a material taking mechanism, a positioning mechanism, a feeding mechanism and an assembling mechanism. The positioning mechanism comprises a lifting assembly, a rotating assembly and a positioning assembly. The lifting assembly drives the rotating assembly and the positioning assembly to move. The rotating assembly drives the positioning assembly to rotate. The positioning assembly comprises an installation seat, a positioning and adsorbing part, a clamping and driving part, a transmission part and two clamping parts. The positioning and adsorbing part is arranged on the installation seat and is usedfor conducting adsorbing and positioning on the part. The two free ends of the transmission part are provided with abutting and pressing slopes correspondingly, each clamping part is provided with anabutting slope, and the cl