Provided is a high geostress fault simulator using non-soil rock materials media, including a first movable unit, a second movable unit, and a stress simulation unit, where the first movable unit includes a first support platform and a second support platform, the second movable unit includes a first movable box, a second movable box, and an accommodation space, and the stress simulation unit includes support frames and stress simulation assemblies in which a to-be-tested model is disposed. The present invention simulates a stress level of a soil mass in a deep formation through the stress simulation unit, thereby simulating triaxial fault effects occurring in the deep formation through the simulator, and further studying an impact of triaxial earthquake fault effects on civil engineering structures under a stress of the soil mass in the deep formation when an earthquake occurs.