A stirring frictional spot welding device comprises an accumulator car, a control system, a spot welding machine, an electric mechanism, a spring balancer, a universal connecting lifting ring and a cantilever beam slide way mechanism, wherein the cantilever beam slide way mechanism is connected with the spring balancer and can move horizontally, the universal connecting lifting ring comprises a horizontal lifting beam, deflection joints, connecting slings and a deflection shaft, the spring balancer is in point connection with the middle of the lifting beam, two ends of the lifting beam are respectively in rotary connection with one end of each deflection joint, the other end of each deflection joint is fixedly connected with one end of the corresponding connecting sling, and the other end of each connecting sling is in point connection with the deflection shaft. A spot welding machine body of the spot welding machine is provided with a shaft hole for the deflection shaft to penetrate through. The cantilever beam slide way mechanism is a gear and rack slide way mechanism, can horizontally move, can perform lifting through a chain mechanism and is arranged on the accumulator car through a column. The stirring frictional spot welding device can freely move among different matrix positions and perform standard operation at a horizontal position or a vertical horizontal position in a multi-angled changing mode.