Ultrafiltration device capable of automatically maintaining constant dialysis

The utility model discloses an ultrafiltration device capable of automatically maintaining constant dialysis, and belongs to the technical field of ultrafiltration. The device comprises an ultrafiltration feed liquid tank, an ultrafiltration assembly and a dialysate tank, the top side of the ultrafiltration feed liquid tank is open, the top of the ultrafiltration feed liquid tank is movably connected with a sealing assembly, a dialysate conveying pipe is arranged on the upper portion of the ultrafiltration feed liquid tank, one end, away from the ultrafiltration feed liquid tank, of the dialysate conveying pipe extends into the dialysate tank, and the other end, away from the ultrafiltration feed liquid tank, of the dialysate conveying pipe extends into the ultrafiltration feed liquid tank. The ultrafiltration assembly is provided with a liquid permeating pipe and is connected with the ultrafiltration material liquid tank through a return pipe and a liquid inlet pipe respectively. In the constant-quantity dia