The invention discloses a high-efficiency energy-saving oil-free lubrication refrigerating compressor. In the compressor, a crank shaft is connected with a machine frame by a motor bearing and is connected with a connecting rod by a connecting rod bearing, and as a rolling bearing does not need lubrication, the oil-free lubrication of a motor is realized; an integrated piston ring filled with a polytetrafluoroethylene composite material is sleeved on a piston steel core to form an oil-free lubrication piston; the filled polytetrafluoroethylene composite material is a self-lubricating material without requiring lubrication, so the oil-free lubrication is realized between the piston and a cylinder; a labyrinth groove is formed on the piston ring, and the sealing between the piston ring and the cylinder is realized by the throttling, expanding and depressurizing action of the labyrinth groove outside the ring on the air; an air inlet filter consists of a gland, a filter element, a lower cover, an asbestos pad and an air intake bolt; and after steam is filtered by a filter element, liquid drops are stopped outside and dry steam enters the cylinder, so air transmission capacity of the compressor is improved, power consumption is reduced and the energy efficiency ratio of a refrigerating system is improved. Thus, the aim of the invention is fulfilled.