The invention provides an earth gas collection screw auger which belongs to the drilling tool technical field. In order to solve the problems of complex operation, inconvenient maintenance, poor strength and limited collection depth lying in the prior earth gas collection screw auger, the invention proposes the earth gas collection screw auger comprising a taper bit body, a close cover screw rod, a drill rod and a handle, wherein the taper bit body is in screwed connection with the taper end of the close cover screw rod, the other end of the close cover screw rod is connected with the drill rod, the drill is then connected with the handle, a gas collection chamber is arranged inside the taper bit, vent holes communicated with the gas collection chamber are arranged on the bit, a filter element and a gasket are arranged inside the gas collection chamber, a gas taking long slim pipe contained in the filter element passes through the center of the gasket, and a holding-down bolt is used to compress the gasket to separate the gas collection chamber from the outer atmosphere. The gas taking long slim pipe is connected with a gas taking device after passing through the close cover screw rod, the drill rod and the handle in turn. The earth gas collection screw auger is a manual earth gas sampling device integrating gas picking and collection with convenient carrying, simple assembly, convenient maintenance, high strength, convenient operation, simplicity as well as reliability.