A drawer seat of a circuit breaker comprises a rotatable rotating shaft assembly, and a guide plate mounted on the inner side of the drawer seat and slidable relative to the drawer seat. A circuit breaker body moves synchronously with the guide plate after placed in the drawer seat. The rotating shaft assembly includes a traction plate. Or the drawer seat of the circuit breaker comprises a rotatable rotating shaft assembly, and the rotating shaft assembly directly drives the movement of the circuit breaker body, and the rotating shaft assembly comprises a traction plate. The traction plate hasa traction groove and a pushing curve segment. The guide plate is provided with a first protruding roller and a second protruding roller synchronously moving with the guide plate. In the process thatthe circuit breaker body exits the drawer seat, the second protruding roller is first pushed by the pushing curve segment, and then the first protruding roller is moved by the traction groove. The traction plate can be made smaller to meet the trend of miniaturization of the circuit breaker.