Coal and gas outburst simulation device with repeated test function and test method

The invention discloses a coal and gas outburst simulation device with a repeated test function. The coal and gas outburst simulation device comprises an outburst cylinder. A Z-direction piston is connected with the top of the outburst cylinder, and an X-direction barrel and a Y-direction barrel are connected with the bottom of the outburst cylinder; a first pipeline is connected with the middle of a side wall of the outburst cylinder, and a second pipeline and a third pipeline are connected with the first pipeline in parallel; a first pressure gauge is arranged on the first pipeline; a high-pressure gas tank is connected with the second pipeline; the third pipeline is connected with a gas suction port of a vacuum pump; a Y-direction piston is connected with the Y-direction barrel, and a coal charging opening is formed in the top wall of the Y-direction barrel; an X-direction piston is connected with the X-direction barrel, and an outburst opening is formed in the top wall of the X-direction barrel; a fourth pipeline is connected with the bottom wall of the X-direction barrel. The invention further discloses a test method implemented by the aid of the coal and gas outburst simulation device. The coal and gas outburst simulation device and the test method have the advantages that natural gush procedures of gas prior to outburst can be simulated, influence of the thickness of front coal on outburst can be simulated, and field conditions can be approximated; repeated multiple tests can be carried out after coal samples are charged at one step, and accordingly the test efficiency can be improved.