The utility model discloses a female station of CNG adds gas column unloading natural gas recycling device, add the gas column including a plurality of, it even has pipeline no. 1 and pipeline no. 2 through the pipeline to add the gas column, pipeline no. 1 is connected with buffer tank I, pipeline no. 2 is connected with concentrated exhaust stack, be equipped with check valve no. 1 and ball valve no. 1 on the pipeline no. 1, be equipped with ball valve no. 2 on the pipeline no. 2, be connected with pipeline no. 3 on the buffer tank I, pipeline no. 3 and two intercommunications of pipeline, be equipped with the relief valve on the pipeline no. 3, be connected with pipeline no. 4 and pipeline no. 5 on the buffer tank I, pipeline no. 4 is connected with the compressor, the entry of compressor even has buffer tank II, be equipped with check valve no. 2 on the pipeline no. 4, pipeline no. 5 is connected with low reaches and uses gas point, I bottom of buffer tank is equipped with the blowoff valve, this device energy saving, and economic loss is reduced, the security at the female station of air entrainment has improved, and the pollution to the environment is avoided.