The invention discloses a zero-pollution pump-back device and an operating method thereof.The device comprises a gas chamber, a vacuum pump, a compression pump and a second quick connector; the gas chamber is sequentially connected with a first electromagnetic valve and the vacuum pump through pipelines, sequentially connected with a compressor, a third electromagnetic valve and a first quick connector through gas exhaust pipelines and sequentially connected with a fourth electromagnetic valve and the second quick connector for recycling tail gas through pipelines.According to the device, vacuum is formed in the gas chamber through the vacuum pump, tail gas of detection equipment connected with the second quick connector is recycled through a vacuum negative pressure difference and collected into a tail gas recycling device or a gas sampling equipment body through the compressor, therefore, zero-pollution detection and exhaust of the gas are achieved, environmental pollution is greatly reduced, and the pollution problem existing in the prior art is effectively solved; in addition, non-pollution gas can be generated to be reused when the tail gas is collected into the equipment body, and the gas utilization stability and reliability of the equipment body are guaranteed.The device has the advantages of being simple in structure and convenient and quick to operate.