The invention discloses a fast combustible gas detection device. The fast combustible gas detection device comprises a shell, wherein a sampling pipe connected with a gas relay is mounted on the shell; the end part, extending into the shell, of the sampling pipe is connected with a gas storage device; a control part for controlling the gas capacity of the gas storage device is arranged on the gasstorage device; an air outlet pipe is connected with the gas storage device, and an ignition detection part is mounted on the air outlet pipe. The fast combustible gas detection device has the advantages of being reasonable in design, simple in structure, convenient to use and the like, and achieves the technical effect of solving the problem that it is difficult for testers to conduct primary judgment on operation faults of equipment on site.