Spray paint robot is mainly composed of robot body, computer and corresponding control system. The hydraulic driven spray paint robot also includes hydraulic oil source, such as oil pump, oil tank and motor. Joint structure of 5 or 6 degrees of freedom is mostly adopted. The arm has a large space for movement and can make complex trajectory movement. The wrist usually has 2 to 3 degrees of freedom and can move flexibly. More advanced spray paint robot wrist USES flexible wrist, can bend to each direction already, can rotate again, its action is similar to the wrist of the person, can extend through lesser hole easily into workpiece interior, spray its inside surface. Spray paint robot is generally driven by hydraulic pressure, with the characteristics of fast movement speed, good explosion-proof performance, etc., can be taught by hand or point number to achieve teaching.