Refrigeration system

The invention discloses a refrigeration system. The refrigeration system comprises a condenser, an evaporator and a separation device, wherein a refrigerant flowing pipeline is arranged between the condenser and the evaporator; the evaporator is provided with a mixed gas outlet; the separation device is connected with the mixed gas outlet and is used for receiving a mixed gas, containing air and the gaseous refrigerant, from the evaporator; the mixed gas in the separation device is suitable for heat exchange with a cold source, so that at least a part of the gaseous refrigerant in the mixed gas is liquefied and is separated from air in the mixed gas; and the separated liquefied refrigerant enters a refrigeration circle of the refrigeration system. According to the refrigeration system, air entering the refrigeration system can be timely collected, air is prevented from entering the condenser, condensation pressure in the condenser is guaranteed reasonable, and working energy efficiency of the refrigeration sy