The invention provides a circuit breaker unlocking power supply wiring device for testing mechanical properties of a handcart circuit breaker, which comprises an AC/DC conversion plug and two binding posts, wherein the AC/DC conversion plug is used for connecting a secondary aviation plug of the handcart circuit breaker, the two binding posts are used for connecting a circuit breaker unlocking power supply, and the two binding posts are respectively connected with corresponding incoming line terminals of the AC/DC conversion plug through a cable. The circuit breaker unlocking power supply wiring device can provide an unlocking power supply for testing the mechanical properties of the handcart circuit breaker through the currently connected unlocking power supply, and enables the handcart circuit breaker to be electrified to remove mechanical locking thereof, thereby being convenient to improve the test efficiency. The circuit breaker unlocking power supply wiring device for testing the mechanical properties of the handcart circuit breaker further comprises a box body, a rotating shaft, a supporting plate and a barrel body, wherein the box body, the rotating shaft, the supporting plate and the barrel body form a pay-off structure with a specific structure. Application of the pay-off structure facilitates collection and release of the two cables under the premise of not affecting the test and helps to keep the neatness of wiring at the test field.