The invention discloses a pre-embedded communication cable trough. The pre-embedded communication cable trough comprises a pipe duct formed by splicing of a plurality of U-shaped preformed members, the adjacent preformed members are fixedly connected through buckle members, the tops of two side edges of each preformed member are provided with bosses, and the bosses are provided with slots for installing a cover plate. The pre-embedded communication cable trough is formed by employing the mode of perform and splicing, the installation is convenient and fast, the laying efficiency of communication cables is greatly improved, and subsequent replacement, maintenance and overhauling of the cables are facilitated; supports used for supporting the communication cables are arranged in the trough,rollers on the supports can assist laying of the cables, the frictional resistance is greatly reduced, good protection and guiding effects can be achieved in a cable laying process, the scratch of thecables due to landing is effectively avoided, and the operation is time-saving and labor-saving; besides, the pipe duct is additionally provided with locking mechanisms used for locking the communication cables so that the communication cables are not easily stolen, and the security of the communication cables is greatly improved.