The invention discloses a refrigeration device. The refrigeration device comprises a first heat exchanger, a second heat exchanger, a flash evaporator and a compressor. The flash evaporator is connected between one end of the first heat exchanger and one end of the second heat exchanger. The compressor comprises an air cylinder, a piston and a sliding piece. A first working cavity and a sliding piece groove are formed in the air cylinder. The piston is arranged in the first working cavity. The sliding piece is movably arranged in the sliding piece groove. A first air suction port and a first exhaust port are formed in the first working cavity. The first air suction port is connected with the other end of the second heat exchanger. The part, located on the tail portion of the sliding piece, of the sliding piece groove serves as a second working cavity. A second air suction port and a second exhaust port are formed in the second working cavity. The second air suction port is connected with the flash evaporator. Both the first exhaust port and the second exhaust port are connected with the other end of the first heat exchanger. According to the refrigeration device, the requirement for the high cost performance can be met; and the refrigeration device has the advantages of being easy to manufacture, safe and reliable.