The invention discloses an automatic tin soldering and welding system for a circuit breaker coil conductive assembly. Nine feeding and discharging mechanisms and three detectors are arranged on the periphery of a rotary plate assembly on a horizontal platform surface in sequence; the nine feeding and discharging mechanisms comprises a tin soldering mechanism, an oil cup, a lower gasket, a coil, an upper gasket, and a feeding mechanism of a magnetic yoke; a finished product discharging box is arranged outside the tin soldering mechanism; the rotary plate assembly comprises an inner plate and an outer rotary plate; twelve stations are arranged towards the outer side of the outer rotary plate in the circumferential direction uniformly, comprising eight station starting mechanisms; each of the twelve stations is provided with a set of station clamp separately; and the twelve station clamps are uniformly arranged on the outer side of the outer rotary plate in the circumferential direction uniformly and are corresponding to the positions of the nine feeding and discharging mechanisms on the circumference of the rotary plate assembly. The automatic tin soldering and welding system is compact in structure, reliable in operation and high in welding quality.