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.