Abstract: With the wide application of hydraulic technology in underground coal mines, sand charging and pressurization hydraulic technology has become a new demand for the application in many fields in underground coal mines, but the lack of applicable sand fracturing pump seriously restricts the development of technology. In order to provide scientific and reliable technical parameters for the design and development of underground sand fracturing pump group in coal mine, through the research and analysis of the characteristics of underground working space in coal mine, the design idea of underground sand fracturing pump group with split module and string arrangement is proposed, and the shape control parameters of split module sand fracturing pump group are given; Through the systematic analysis of the water and power supply conditions in the coal mine, the upper limit of the hydropower capacity of the sand fracturing pump group in the coal mine is defined; The fracture pressure of coal seams in mining areas of many provinces in China is statistically studied. Based on the analysis of the rock breaking principle of water injection fracturing and the work principle of fracturing pump, the preset values of the output pressure and displacement of sanding fracturing pump are proposed, and the preset values are verified and verified by simulation test through the calculation of fracturing pump power, physical test of pipeline sand carrying flow and numerical simulation test of fracture sand spreading. Finally, the control dimension of the split module of the sand fracturing pump applicable to the underground coal mine is finally obtained, the height should not exceed 2.0m, the width should not exceed 1.4m, the power supply voltage should be 1140V or 3300v, the operating pressure of the pump unit should not be less than 30MPa, and the reasonable range of output displacement should be 1~1.5m3/min, which provides a design basis for the design and development of the sand fracturing pump in the underground coal mine, It also provides a reference for further research on the technology of adding sand and boosting hydraulic pressure in underground coal mine.