The invention discloses a method for improving the stability of a power hardware-in-loop hybrid real-time simulation system. By establishing a model of the power hardware-in-loop real-time simulation system, a power amplifier link in the model is determined, a model of the main factor influencing hybrid real-time simulation is obtained through analysis and comparison, a compensation link is connected in an RTDS in series through calculation, and then unstable factors are eliminated to improve the stability of hybrid simulation. According to the method, the function of improving stability is added in a software module of the RTDS to form a uniform hybrid simulation system, and thus the stability of hybrid simulation can be easily improved; besides, implementation is flexible, operation is easy, the stability and bandwidth of system simulation can be improved to some extent, the building safety and running robustness of a simulation platform are improved, and a new method and way are provided for study on stability improvement of the power hardware-in-loop simulation system.