The invention relates to coal mine underground gas extraction technologies and discloses a porous combined extraction single-hole gas extraction parameter automatic circuit inspection device. The device comprises an extraction main path; an extraction circuit is provided with at least one set of automatic circuit inspection component; each automatic circuit inspection component comprises an outercontainer enclosing the pipe wall of the outer portion of the extraction main path, extraction pipes, electromagnetic three-way valves mounted on the extraction pipe sections located in the outer container, and a single-hole inspection pipeline, wherein the first end of each extraction pipe is connected with the extraction main path; extraction pipe main bodies penetrate through the outer container, and the second ends of the extraction pipes are arranged outside the extraction pipe main bodies; the first end of the single-hole inspection pipeline is connected to the outer container; and the single-hole inspection pipeline communicates with a gas inspection channel. The independent drilling combined extraction channel and the single-hole inspection channel are established, gas flow channels can be automatically switched, and the goal of no interference between porous combined extraction and single-hole inspection is achieved. The invention further provides a porous combined extractionsingle-hole gas extraction parameter automatic circuit inspection method.