The invention relates to the technical field of valve processing, and discloses a welding device for multifunctional valve processing, which includes a support seat, the top of the support seat is fixedly connected with a support frame, the top of the support frame is fixedly connected with a top plate, and the bottom of the top plate is connected with an electric pusher. One end of the rod is fixedly connected, the other end of the electric push rod is fixedly connected with the top of the lifting plate, one side of the lifting plate is fixedly connected with the first slider, and one end of the first slider is inserted into the first chute and connected with the first chute internal sliding connections. The welding device for multifunctional valve processing, through the setting of the fixing plate, the supporting plate, the threaded rod, the bearing, the fixing plate, the second slider, the second chute and the rubber fixing pad, the valve can be welded better. Fixing solves the problem that the existing valve welding device cannot fix the valve during welding, thereby avoiding the shaking of the valve during welding, so that the quality of valve welding can be better.