The invention belongs to the technical field of circuit breakers and in particular relates to a mechanical feature state evaluation device and method based on a circuit breaker travel signal. The mechanical feature state evaluation device comprises a circuit breaker, a travel sensor, a voltage regulation element, an AD (analog-digital) conversion element, a clock element, a power supply element, a central processing unit, a communication unit and a state evaluation upper computer. According to the mechanical feature state evaluation device and method based on the circuit breaker travel signal, the switch-on time, the switch-off time, the switch-on asynchronism, the switch-off asynchronism, the just switch-on speed, the just switch-off speed, the average switch-on speed and the average switch-off speed are obtained through direct calculation according to the circuit breaker travel signal and are used as evaluation indexes, and a current running state and tendency of a mechanical feature of the circuit breaker are finally supplied by an extension evaluation algorithm based on an entropy weight. According to the method, the influence of an indirect signal and an objective factor is reduced, and the accuracy of an evaluation result is improved.