The invention provides a circuit-breaker spring actuating mechanism which comprises a frame, an energy storage component, a closing component and an opening component, wherein the energy storage component comprises an energy storage driving device, a big gear, an energy storage shaft, two energy storage crank arms, two closing springs, an energy storage clutching block and an energy storage maintaining latch; the closing component comprises a closing driving device, a closing electromagnet bent plate and a closing driving crank arm; and the opening component comprises an opening driving device and an opening electromagnet bent plate. The internal space of the actuating mechanism is fully utilized, the assembling positions of parts are accurate, functional units are distributed in an orderand centralized way, the completeness of functions and the reliability of transmission links are ensured, and the integration of the actuating mechanism is realized. Meanwhile, the balance of stressing and the rationality of structure during the actuating process of the circuit breaker are fully considered, the designed circuit-breaker spring actuating mechanism has compact structure and small size, different specifications of circuit-breaker frames can be assembly easily, and great convenience is brought for large-scale production and product generalization.