Gearbox side clamping device

The utility model relates to the field of gearbox machining, and discloses a gearbox side clamping device which comprises a base, fixing blocks are fixedly connected to the left side and the right side of the upper portion of the base respectively, a sliding groove is formed in one side of each fixing block, a lifting mechanism is arranged on the upper portion of the base, and a workbench is fixedly connected to the upper portion of the lifting mechanism. Vertical blocks are fixedly connected to the left side and the right side of the upper portion of the workbench correspondingly, guide grooves are formed in the inner walls of the vertical blocks correspondingly, clamping mechanisms are arranged in the vertical blocks, placing plates are fixedly connected to the lower portions of one sides of vertical plates correspondingly, and each clamping mechanism comprises a second motor, a second threaded rod, a moving block, a guide block, a clamping plate and a sponge pad. The output end of the second motor is fixed