Refrigerating system and control method thereof

The invention discloses a refrigerating system and a control method thereof. The refrigerating system comprises a compressor, an outdoor heat exchanger, a first throttling device, a gas-liquid separation device, an indoor heat exchanger and a switching device, wherein a first outdoor end opening of the outdoor heat exchanger is connected with an exhaust opening; the gas-liquid separation device is provided with an outdoor heat exchanger connector, an indoor heat exchanger connector and a separation outlet; a second throttling end opening of the first throttling device is connected with the outdoor heat exchanger connector, and the separation outlet is connected with a second cylinder gas inlet; a first indoor end opening of the indoor heat exchanger is connected with the indoor heat exchanger connector; the switching device is separately connected with a first cylinder gas inlet, the exhaust opening and a second cylinder opening and closing gas opening; and the second cylinder opening and closing gas opening is connected with one of the first cylinder gas inlet and the exhaust opening through the switching device. According to the refrigerating system of the invention, the possibility that the compressor is damaged due to cylinder liquid absorption can be reduced, and the running capability of the compressor can be ensured.