Welding robot is a kind of industrial robot which specializes in welding, and is a programmable automation control machine. It is widely used in automobile welding and its parts production because of its special use, which reduces the requirement of workers’technology. The control system is a very important part of the robot. Based on the research and design of hardware and software, the control system of welding robot is built, and it meets the needs of specific products industry by test and trial operation.