The utility model relates to a welding taper sleeve shaft disc. The welding taper sleeve shaft disc comprises a shaft disc body. A shaft disc hole is formed in the shaft disc body. An impeller back disc is fixedly connected to the shaft disc body, the shaft disc hole is in a cone shape, a taper sleeve is arranged inside the shaft disc hole, the outer wall of the taper sleeve is matched with the inner wall of the shaft disc hole, an axial notch which penetrates through the wall thickness of the taper sleeve is formed in the taper sleeve, the inner wall of the shaft disc hole is provided with two arc-shaped inner threaded holes which are symmetrically formed in the axial direction, the outer wall of the taper sleeve is provided with two arc-shaped outer threaded holes which are symmetrically formed in the axial direction, the arc-shaped inner threaded holes of the outer wall of the taper sleeve and the arc-shaped outer threaded holes of the inner wall of the taper sleeve are correspondingly matched to form a complete threaded hole, and a screw is screwed into the threaded hole. The inner portion of the taper-shaped shaft disc is in taper fit with the taper sleeve, threaded holes which are mutually matched are formed in the shaft disc hole and the taper sleeve, and a set screw is screwed with the complete threaded hole in order to enable the taper sleeve to move in the shaft disc hole in the axial direction. The inner conical face of the shaft disc hole is used for tightening the taper sleeve to clamp an impeller shaft or loosening the taper sleeve to disengage the impeller shaft, and the taper sleeve can be used for flexibly clamping or disengaging the impeller shaft, so that installation, dismantling and maintenance are convenient.