The invention relates to a novel connecting pipe, comprising a first pipe body, a second pipe body, a butterfly valve body and a protective cover, wherein the right end of the first pipe body is connected with the left end of the first pipe body through a flange, a valve blade is arranged in the butterfly valve body, a rubber sealing ring is arranged between the valve blade and the butterfly valvebody, the valve blade is connected with a rotating shaft which passes through the butterfly valve body, the first pipe body and the flange successively, one end, out of the flange, of the rotating shaft is provided with a handle, the valve blade is provided with am overpressure channel, a pressure protection valve is arranged in the overpressure channel, and the protective cover is detachably connected with the outer side of the handle. The design has the advantages of simple structure, easy manufacture and practicality and high-efficiency.