Abstract: In view of the problems such as long period of automatic process parameter debugging, high cost and difficult construction of working environment, the key technology of virtual process debugging of hydraulic support group process is studied based on digital twin technology. Firstly, based on modern modeling technology, a 1∶1 twin of three fully-mechanized mining machines was constructed, and virtual reconstruction and simulation of the three mechanized mining machines were carried out by virtual reality engine. Then, based on the modern design theory and the principle of three-machine collaboration, different parameters in the automatic process of the following machine are configured, and the decision-making model of the support behavior of the coal mining process is established, and the decision-making model is rehearsed in the virtual scene. Finally, the virtual and real interaction channel is established by TCP protocol, and the decision model is verified by semi-physical simulation experiment. The results show that the virtual scene can accurately reproduce the physical working face scene in the implementation of coal mining technology, the support group behavior decision model can be used to make decision planning of the hydraulic support process behavior in advance, and the real-time virtual-real interaction of the support controller can be carried out through the reverse control experiment. It is expected to overcome the obstacles of underground commissioning environment and provide useful reference value for the reasonable formulation and revision of hydraulic control program of the third mechanized mining machine.