The invention relates to a cold feedback system by magnetic liquid magnetic refrigeration which comprises a magnetic system, a refrigeration bed and a heat switch room, wherein the refrigeration bed and the heat switch room are all equipped with a heat exchanger, the heat exchanger in the refrigeration bed is connected to the heat switch room through pipes, and forming a closed circulation loop in which a circulating pump is arranged, the heat exchanger in the heat switch room is connected to the refrigeration bed through pipes, and forming a closed circulation loop in which a circulating pump and a heating radiator are arranged. The advantages of the invention are energy conservation, environmental protection, simplified structure, and high refrigeration efficiency.