According to factory acceptance test of the first set of subsea emergency well sealing device developed independently in China, the test device for simulated blowout condition with the maximum flow of 8 000 m3/d and the maximum working pressure of 103.5 MPa was developed. In order to establish scientific and reasonable blowout simulation facilities, the best scheme was optimized through theoretical research. Based on the test program, the driving mode and control detection system of the pumping system were determined; based on the simulated blowout test, large displacement sand erosion test and high pressure erosion test, the pumping system, bearing lubrication system, filling and filtering system, mud mixing system and hydraulic control system were determined. The main structure of 190 mm plunger hydraulic end and high pressure erosion test bench for large displacement erosion test were studied. The research results can provide reference for the design and manufacture of large displacement and high pressure sand bearing fluid erosion test bench in domestic drilling and production industry.