Disclosed is a clutch shell die-casting device. The clutch shell die-casting device comprises a base, a mounting plate, vertical plates, bolts, sliding grooves, a power line, a die-casting box, extrusion plates, hydraulic columns, spiral springs, a motor, polishing pieces, limiting holes, penetrating holes, first clamp nuts, second clamp nuts and connecting rods. The clutch shell die-casting device has the advantages that the motor is installed inside the base, the mounting plate is connected to the upper portion of the motor, and therefore the motor can drive the mounting plate to rotate in the working process; the bolts are connected with one side of one vertical plate and the other side of the other vertical plate, each sliding groove is formed in one side of the corresponding vertical plate, and therefore the up-and-down position of each bolt can be adjusted through the two corresponding clamp nuts; and each connecting rod is installed at one end of the corresponding bolt, each penetrating hole and the corresponding limiting hole are formed in one side of the corresponding connecting rod, and therefore each polishing piece at the bottom of the corresponding connecting rod can be adjusted to polish different positions of the surface of a clutch. By the adoption of the clutch shell die-casting device, a clutch shell can be formed in a die-casting mode and can also be polished through the polishing pieces on the upper portion. The positions of the polishing pieces can be adjusted according to shells with different sizes in the working process.