Device and method for sampling greenhouse gas released from non-aeration unit of sewage treatment

The inventive device for sampling greenhouse gas released from a non-aeration treatment process of sewage comprises a floating body, a gas collection tank, a temperature monitoring assembly and a gas sampling assembly, wherein the floating body is fixed at the lower part of a gas collection barrel via a floating body baffle on the gas collection tank; the gas sampling interface at the upper end of the gas collection tank is in sequential connection with a three-way valve, a small-sized gas sampling pump and a gas sampling bag by a silicone pipe; and the wire connecting a temperature probe, the wire connecting a pressure probe and the wire connecting a agitator pass through the rubber plug on the gas collection tank to get connected with a digital display thermometer, a high-precision digital barometer and an agitation apparatus power supply respectively. The inventive device has simple structure, good sealing, convenient operation, and representative sampled gas, can realize timely, accurate and batch collection of greenhouse gas released from a non-aeration treatment process of sewage, and can find wide application in collection of greenhouse gas released from a non-aeration treatment process unit of sewage.