The invention provides a tandem type
magnetic refrigeration system which comprises n magnets, n magnetic regenerators arranged corresponding to any
magnet, electromagnetic valves arranged between the adjacent magnetic regenerators, a low-temperature end
heat exchanger, a high-temperature end
heat exchanger and a hydraulic
piston pump, and n is an integer larger than 1. According to the tandem type
magnetic refrigeration system, through graded starting of the
magnetic refrigeration system, the needed large temperature span is achieved through few kinds of
magnetic heating working media, the number of
magnetic heating working medium materials is reduced, the number of filling
layers of the
magnetic heating working media is reduced, the difficulty of the magnetic heating working medium production technology is reduced, cost is saved, and reliability is improved; in addition, when the
Curie temperature difference value of the multiple
layers of magnetocaloric working media is large, the magnetocaloric working medium
layers with the
Curie temperature greatly deviating from the environment temperature can exert the magnetocaloric effect and generate
cooling capacity, and the magnetocaloric working medium layers cannot serve as
heat capacity loads.