The invention discloses an electrified switch-on and switch-off time detection method for mechanical properties of a high-pressure circuit breaker. The electrified switch-on and switch-off time detection method includes before operation of the circuit breaker, measuring switch-on time and switch-off time of a primary side of the circuit breaker and fitting time of an auxiliary contact of a corresponding circuit; under switch-on and switch-off circuit conditions, measuring charging start time of a corresponding secondary-side coil and action time of the auxiliary contact; subtracting the acquired charging start time from the corresponding action time of the auxiliary contact to acquire a corresponding time difference; adding the fitting time of the auxiliary contact to the time difference to acquire switch-on time and switch-off time of a secondary side; if the switch-on time and the switch-off time of the secondary side are equal to those of the corresponding primary side, judging thatthe circuit breaker does not have defects, and if not, judging that the circuit breaker has the defects. The electrified switch-on and switch-off time detection method has the advantages of few usedsensors, few extracted data and small error range.