The invention discloses a circuit breaker contact engagement depth measurement device which is convenient and reliable and good in measurement precision. The device comprises six sets of displacement sensors. The six sets of displacement sensors are arranged in A-B-C three-phase six moving contact internal counterbores of a high-voltage switch cabinet handcart-type circuit breaker respectively; a power line and a signal line are led out through circumferential gaps of a plum blossom contact, and a high-voltage switch cabinet is led out through space of the handcart-type circuit breaker and is connected with a data processing device; and the data processing device is connected with a display device. The device is reasonable in structure, and convenient and accurate to measure.