The invention provides a digital simulation system and circuit breaker operation cabinet on-off interface implementation method. Aiming at the situation that on-off signals between an on-off model (a circuit breaker or a disconnector switch) in a simulation system and a circuit breaker operation cabinet cannot be directly interacted when the digital simulation system is used for carrying out a digital-analog hybrid simulated test, the method achieves effective transmission of the on-off signals between the digital simulation system and the circuit breaker operation cabinet by a method of constructing a control loop functional module in simulation software and starting from types, characteristics and logic relations among specific functions to be implemented of the on-off signals of the simulation system and the circuit breaker operation cabinet. The method belongs to a software solution and can effectively solve the problem that types of the on-off signals between the on-off model in the simulation system and the circuit breaker operation cabinet are unmatched by the aid of the designed control loop functional module and without adding hardware interface equipment.