The invention belongs to the technical field of nuclear waste treatment, and particularly relates to a system of simulating characteristics of a high-level waste geology treatment room, which aims to provide the system capable of simulating the heat-water-power-chemistry coupling characteristic of the high-level waste deep geology treatment room. The system comprises a water supplying and gas-supplying device (1), a temperature control device (8), a multi-field coupling experience device, a measuring system, a data collecting system (10) and a data processing system (19). The system uses the multi-field coupling experience device as a core, the outermost layer of the system is a barrel-like stainless cavity body (4) with a sealing cover, and the innermost layer of the system is a cylindrical shape for simulating a heater (3) of the high-level waste. The invention provides a bentonite heat-water-power-chemistry coupling experience device under the condition of the multi-field coupling, has the characteristics of high strength, small deformation, corrosion resistance, good sealing property, high measuring precision and the like, and is suitable for a mock-up long experience of the bentonite under the condition of a simulated treatment room.