The invention discloses a system and method for testing a circuit breaker auxiliary switch, and the system comprises a processor, a plurality of switches which are used for controlling the on/off of all nodes in the circuit breaker auxiliary switch, a controller for controlling the plurality of switches, an auxiliary switch on/off testing circuit for detecting the on/off of all nodes of the circuit breaker auxiliary switch, and an auxiliary switch contact resistance testing circuit which is used for detecting contact resistances of all closed nodes of the circuit breaker auxiliary switch. The output end of the processor is connected with the input end of the controller, and the output end of the controller is connected with the control ends of the plurality of switches. The output end of the auxiliary switch on/off testing circuit and the output end of the auxiliary switch contact resistance testing circuit are respectively connected with the processor. The system and method can complete the testing of the circuit breaker auxiliary switch quickly and effectively.