The utility model discloses a spring operating mechanism for a circuit breaker. The spring operating mechanism comprises a main case, wherein a tripping unit and a closing unit are fixedly arranged on the main case; a tripping-and-closing module consists of the tripping unit and the closing unit; the tripping-and-closing module comprises a left side mounting plate and a right side mounting plate, and the left and right side mounting plates extend along the axial direction of an output shaft of an output shaft component in parallel; the left and right side mounting plates are fixedly connected by a connecting piece to form a mounting frame; mounting holes corresponding to components of the tripping unit and the closing unit are arranged in the left and right side mounting plates of the mounting frame; and an energy storage motor, a camshaft component and an energy storage retaining device of the closing unit, and a tripping retaining component of the tripping unit are correspondingly mounted in the mounting space formed by the left and right side mounting plates on the mounting frame. According to the spring operating mechanism for the circuit breaker, the whole layout is reasonable, and room for the upgrading of the operating mechanism in the future is left.