The invention provides a non-real-time semi-physical simulation synchronization method and device for a power grid information physical fusion system. The method comprises the following steps: addinga communication simulation event and a power simulation event into a global event axis according to an occurrence sequence, and realizing simulation synchronization of communication simulation and power simulation on a virtual time axis by transmitting a simulation data packet with a timestamp and calculating communication transmission delay. According to the technical scheme provided by the invention, the problem that the power simulation speed and the communication simulation speed are inconsistent is mainly solved, the realization of joint simulation of non-real-time power simulation software and real-time communication simulation software is facilitated, and the goal of accessing physical equipment to perform semi-physical simulation in a non-real-time joint simulation system is realized.