Tunnel boring machine main bearing performance simulation test bench and lubrication flow field test method

The invention provides a tunnel boring machine main bearing performance simulation test bench and a lubrication flow field test method, and relates to tunneling machine simulation equipment, the tunnel boring machine main bearing performance simulation test bench comprises an oil pool providing an oil bath environment, a main bearing arranged in the oil pool through a main bearing mounting seat, and a loading device and a rotating device arranged outside the oil pool, the loading device is used for simulating the axial load and overturning moment borne by the main bearing, the rotating device is used for driving an inner gear ring of the main bearing to rotate, an oil pumping system is arranged near the oil pool and pumps oil into the main bearing through an oil inlet of the main bearing, and related test parameters of the main bearing are obtained through the measuring system. The main bearing is in a vertical state, the movable block is arranged on the main bearing mounting base and used for observing and t