The invention relates to an optimal control method for real-time safety correction of gateway electric power of a multi-energy system and belongs to the technical field of integrated energy system operation and control. The method has the advantages that by utilizing the characteristics of multi-energy coupling and complementing, the purpose of reducing the gateway electric power of the multi-energy system is achieved through the cooperative control of various energy devices such as electrical energy devices, thermal energy devices, cold energy devices and the like and the optimal real-time safety corrective control is realized by using linear optimization; an optimal control model for the real-time safety correction is provided, the linearization of the optimal model is realized by specifying the adjustment direction of each device and the rapid solving and the engineering application are benefited; and the method can be applied to the real-time online operation control of the multi-energy system and when the situation that the gateway electric power exceeds the upper limit is monitored, the adjustment amount of each device is calculated through the method, the gateway electric power is reduced and the safe operation of the multi-energy system is guaranteed.