The invention discloses a reset mechanism of an execution mechanism of a low-voltage circuit breaker. The reset mechanism comprises a reset bracket arranged on the base, a reset seat and a reset seat assembly, wherein the reset seat is provided with a hollow cavity; the reset seat assembly comprises a flux top block, a reset pressure spring and a reset seat; the reset pressure spring and the flux top block are arranged in the hollow cavity of the reset seat; one end of the reset pressure spring is propped against the reset seat and the other end is propped against the flux top block; and the circuit breaker drives the reset bracket to move in a rotating manner when opened, and the reset bracket is in contact with the reset seat and pushes the reset seat assembly to carry out linear motion, so that the flux top block pushes a flux transformer to reset. The circuit breaker drives the reset bracket to move in a rotating manner when opened, and the reset bracket is in contact with the reset seat and pushes the reset seat assembly to carry out linear motion, so that the lateral force component to a flux top rod is reduced, a coating on the flux top rod is not damaged after the flux transformer moves for multiple times and the life of the flux transformer is prolonged.