The invention provides an air supply pipeline. The pipe wall of the air supply pipeline is provided with an opening in the length direction of the pipeline, the two sides of the opening are correspondingly connected and provided with a chain belt I and a chain belt II, chain teeth I are arranged on one side edge of the chain belt I, chain teeth II are arranged on one side edge of the chain belt II, a ventilation sliding block device is arranged at the joint between the chain belt I and the chain belt II, the ventilation sliding block device structurally comprises guide ports formed in the twoends, a bottom plate, a cover plate and an inner core body, and the bottom plate is connected with the cover plate through the inner core body. According to the air supply pipeline, the parts, on theouter sides of the guide ports of the ventilation sliding block device, of the chain teeth I of the chain belt I and the chain teeth II of the chain belt II are in an engaged state, the parts, locatedin the ventilation sliding block device, of the chain teeth I and the chain teeth II are disengaged by the inner core body, and air outlet holes are formed in the part, located inside the air supplypipeline, of the bottom plate or the cover plate of the ventilation sliding block device.