Abstract: Various types of semi-physical operating platforms are gradually applied to mine equipment training, but there are problems such as long development cycle and resources waste in developing specific data acquisition system for specific simulated equipment. Based on analysis of data acquisition requirements of semi-physical fully mechanized mining operating platform, an extensible data acquisition system was designed. The core of the system is data acquisition board composed of main board and extension circuit board. The main board and extension board can acquire 8-channel analog signals and 16-channel switching signals respectively. Modes of one main & multi-extension and one main & multi-slave & multi-extension can be realized through different combinations of the main board and extension board, which are respectively suitable for data acquisition mainly based on switching signal and analog signal. The system can meet data acquisition requirements of various types of semi-physical operating platforms and has a certain degree of universality.