In order to expand the friction stir spot welding equipment application need, increase the design efficiency and reduce the hardware cost, the development and integration of the friction stir spot welding machine’s single MCU portable control terminal were researched. The development method of the integration of single MCU portable control terminal and friction stir spot welding machine’s control system was introduced, and design of the analyzer in the control system was analyzed in detail, as well as of real-time performance and precision of the network communication of the terminal. The development method of integration of the terminal and the spot welding control system has been verified on the platform of portable welding equipment, and design and development efficiency is improved.