True triaxial multi-field coupling test device and test method

The invention discloses a true triaxial multi-field coupling test device and method, and the device comprises a normal loading device and a horizontal confining pressure device, and also comprises a sample box, a normal loading plate, an injection terminal and a pressed sealing plate; the sample box comprises a sample box main body and a heating system; four horizontal loading plates are arranged in the sample box main body; the normal loading device comprises a static load loading mechanism and a dynamic load loading mechanism; a fracturing fluid flowing channel is arranged on the normal loading plate; and the pressed sealing plate is provided with a through hole for the injection terminal to pass through. The sealing problem of fracturing fluid at high temperature can be effectively solved, mechanical property research on ore materials such as coal rock mass or concrete under the multi-field coupling condition of a stress field, a temperature field and a seepage field can be achieved, and the complex multi-