Circulating reflux type gas fire extinguishing system detection device

The utility model relates to the field of gas fire extinguishing system detection, in particular to a circulating backflow type gas fire extinguishing system detection device. The technical problem that in the using process of an existing gas fire extinguishing system detection device, gas circulation is mostly achieved through a sucking pump, and therefore the using cost of the whole detection device is very prone to being increased is solved. According to the technical scheme, the circulating backflow type gas fire extinguishing system detection device comprises a shell assembly, a gas inlet assembly, a detection assembly, a rotating assembly and an exhaust assembly; and one side of the shell assembly is fixedly connected with an air inlet assembly. According to the fire extinguishing gas detection device, the rotating assembly is protected through the shell assembly, fire extinguishing gas is fed into the detection device through the gas inlet assembly, the concentration of the fire extinguishing gas is de