The invention discloses a segmented composite drain pipe. The segmented composite drain pipe comprises a drain pipe formed by combining more than one connecting pipes and intermediate connecting pieces, wherein the two adjacent connecting pipes are connected by one intermediate connecting piece; both ends of each connecting pipe are open, the open ends of both ends are sealed by sealing covers, through holes are formed in the middles of the sealing covers, and a sealing layer is arranged in the middle of each sealing cover; an assembly hole penetrating through the left and right sides of eachintermediate connecting piece is formed in the middle part of each intermediate connecting piece, one end of each connecting pipe is installed in each assembly hole, a water inlet cavity is formed inthe middle of each intermediate connecting piece, and a drainage channel in the middle of each connecting pipe is connected and communicated with each water inlet cavity. The segmented composite drainpipe has a simple structure, can realize the water stop operation at any position of the drain pipe, the waste of water resources can be reduced, and rotation can be carried out among the connectingpipes to reduce damage caused by torsional forces.