The invention relates to the production field of electronic components, in particular to a microswitch full-automatic assembly production system and a transition conveying device. The utility model relates to a transition conveying device which is assembled automatically by a microswitch. The device comprises a sixth mounting seat, a rotating seat assembly, a stepping motor, a belt transmission assembly, a support plate, an infrared sensor assembly, a thirteenth cylinder, a pushing assembly and a blanking track. The invention solves the problem that the elastic piece and the rear shell are difficult to assemble side-by-side, and the semi-finished work piece is turned 90 degrees into a flat state, so that the assembly is convenient from above, the success rate of the transitional conveyingdevice is high, and the equipment failure can be eliminated through the related parts. The invention also discloses a method for assembling the semi-finished work piece.