The invention discloses a control system for a mechanical arm. The structure of the control system comprises an emergency stop button, a controller lifting hook, a liquid crystal display, a data connection port, a product nameplate, a controller main body, a control panel, controller function buttons, a power source line protective sheath, a power source conductor and a power source connector. According to the control system for the mechanical arm of the invention, a bolt controller is adopted, a bolt on the power source connector can be screwed to the mechanical arm through a button and a knob when the control system for the mechanical arm is used, and therefore, manual operation for fixedly connecting the bolt on the connector to the mechanical arm through a screwdriver is not required,work efficiency can be improved, and the practicability of the device is improved.