Harmful gas detection device

The invention relates to a harmful gas detection device, and belongs to the technical field of intelligent pipe gallery detection equipment. The harmful gas detection device comprises a base and a toxic gas detector arranged on the base; a purification box is further arranged on the base; a transfer box is arranged on a part, located at one side of the purification box, on the base; a plurality ofsuction pipes are arranged on the transfer box; the suction pipes communicate with the interior of the transfer box; an adsorption assembly is arranged between the transfer box and the purification box and is used for sucking harmful gas in the transfer box into the purification box; an exhaust pipe is arranged on the purification box; the exhaust pipe communicates with the interior of the purification box; a filtering and purifying device is arranged between the exhaust pipe and the purification box; the filtering and purifying device is used for purifying and filtering harmful gas and dust,and an exhaust assembly is arranged at one end, away from the purification box, of the exhaust pipe and used for exhausting gas in the exhaust pipe. The harmful gas detection device has the advantages that the harmful gas can be purified conveniently after the harmful gas in the pipe gallery is detected, and flying dust is adsorbed.