The invention relates to a hybrid real-time simulation method for continuous long-time steady operation of a power system, and belongs to the technical field of transient simulation of the power system. The method comprises the following steps of: establishing a hybrid real-time simulation interactive computing system and a resolution analysis model for the power system, dividing the power systeminto an electromagnetic transient side system and an electromechanical transient side system at a meshing interface, analyzing the characteristic value of a state matrix in the resolution analysis model to obtain a computing system mode, judging the mode, setting a one-order inertia system according to the judgment result, verifying the steady gain in the resolution analysis model, and setting a scale factor according to the verification result so as to realize flat start. According to the method, the hybrid simulation can be steadily performed; the method ensures that the hybrid real-time simulation has no steady error so that the hybrid real-time simulation can be continuously performed for long time, and does not affect the simulation of transient and dynamic processes of the hybrid real-time simulation; and the method can ensure that the hybrid real-time simulation reaches a steady state in 3 seconds after closing a loop, and can perform more than 8 hours of continuous hybrid real-time simulation.