The present invention discloses a conduit scabbard which includes a scabbard pipe and an outspread pipe which is put through the scabbard pipe. The pipe wall of the scabbard pipe is provided with two strips of laniating slots which lengthways extend and divide the scabbard pipe into two half sections. One end of the scabbard pipe is fixedly connected with two lamellas of scabbard pipe joints, and each lamella of the scabbard pipe joint is respectively locates at one half section of the scabbard pipe. Each lamella of the scabbard pipe joint includes a combining part which extends along an external pipe wall of the scabbard pipe and a pulling part which extends outwards from the combining part, wherein the combining part is nodulized at the external pipe wall.