The invention provides a gas filtration pipe assembling machine, and belongs to the technical field of auxiliary equipment for production of medical instruments. The gas filtration pipe assembling machine comprises a machine frame and a rotary disc device arranged on the machine frame. The rotary disc device comprises a rotary disc and a rotary disc driving mechanism which is arranged on the machine frame and can drive the rotary disc to rotate intermittently. A rotary disc jig used for carrying a plastic pipe is arranged on the rotary disc, and with the rotary disc as the center, a feeding device, a filtration cotton feeding and assembling device, a gas filtration pipe ventilation detection device, a gas filtration pipe vision detection device and a finished product discharging device aresequentially on the outer circle of the rotary disc in the circumferential direction. The operating process includes the steps of plastic pipe feeding, filtration cotton feeding and assembling, detection and finished product discharging, the rotary disc jig is arranged on the rotary disc and rotates intermittently along with the rotary disc, and thus a gas filtration pipe sequentially reaches allstations so as to be assembled. The gas filtration pipe assembling machine is compact in structure, screening is conducted through detection of various items, and the rate of superior finished products is increased.