High-power Stirling cryocooler device

The invention discloses a high-power Stirling cryocooler device which comprises two or more power piston structures and a discharger structure, and the two or more power piston structures are in fluid communication with the discharger structure. The power piston mechanism comprises a power piston, and the ejector structure comprises a first piston, an ejector plate spring and a second piston which are sequentially arranged in the axial direction of the ejector structure. In the refrigeration process, two or more power pistons of the two or more power piston structures and the first piston form a compression cavity, high-pressure gas flows in an expansion cavity and the compression cavity in the end, away from the exhaust plate spring, of the second piston in a reciprocating mode, and the gas in the expansion cavity does positive work on the exhauster structure, so that refrigeration is provided; according to the device, the space of a compression cavity is increased through ingenious design and arrangement of