The invention discloses a low-voltage circuit breaker electromagnetic assembly welding system. The system comprises a rotary disc assembly arranged on a machine frame; the rotary disc assembly comprises a rotary disc and eight fixture assemblies; the rotary disc is arranged on a horizontal table, the lower surface of the rotary disc is provided with a multi-station indexing mechanism, and rotary disc is provided with a transmission mechanism of its own; eight feeding and discharging mechanisms are sequentially arranged in the positions, surrounding the periphery of the rotary disc, of the horizontal table and the machine frame, specifically, the eight feeding and discharging mechanisms comprise the oil cup feeding mechanism, the lower gasket feeding mechanism, the upper gasket feeding mechanism, the magnet yoke feeding mechanism, the coil feeding mechanism, the upper gasket taking mechanism, the magnet yoke taking mechanism and the soldering mechanism, and the outer side of the soldering mechanism is provided with a finished product discharging outlet. All the mechanisms are connected with a central controller. The invention further discloses a full-automatic circuit breaker electromagnetic assembly welding method. According to the system and the method, the structure is compact, the full-automatic degree is high, and the finished product quality is good.