The invention discloses a jig for processing a centrifugal pump shell, which comprises a fixed frame, a pressing mechanism, a rotating mechanism and a clamping mechanism. Connection, the pressing mechanism is connected with the clamping mechanism, the fixed frame includes the bottom plate, the supporting plate, the fixing plate, the chute, the threaded hole, the positioning rod, the rectangular frame, the rotating tray and the connecting plate, the fixture of the centrifugal pump shell, the pressing mechanism , the rotation mechanism and the clamping mechanism are combined in turn, the setting of the connecting sleeve can meet the rotation requirements of the second rotating shaft, the setting of the limit slide bar and the linear groove can meet the sliding requirements of the collar when the central rotating shaft rotates, so that Each mechanism can operate independently, and each operating mechanism does not need to load the weight of other driving equipment. The coordination effect of each mechanism is good, and the space utilization rate is high. The pump body is fixed by fixing the flange, and the specific clamping model is avoided to effectively fix the pump body. disadvantages.