Clamp tool for motor coupler type workpieces

The utility model provides a fixture tool for a motor coupler type workpiece, which comprises a workbench, a shaft body positioning structure and a hub body positioning structure are arranged on the workbench, the shaft body positioning structure comprises a positioning base, and the positioning base is used for placing a shaft body of a coupler; a pressing mechanism is arranged on one side of the positioning base and comprises a pressing plate and a first oil cylinder, the first oil cylinder is used for driving the pressing plate, and an upper arc-shaped groove of the pressing plate can apply downward pressure to a shaft body in a lower arc-shaped groove; the hub body positioning structure comprises a connecting key and a second oil cylinder, one end of the connecting key is used for being connected with a hub body of the coupler, and the connecting key moves in the horizontal direction under the action of the second oil cylinder. The shaft body of the coupler is pressed and clamped through the pressing plat