The utility model discloses a support for inserting cables in pipe network engineering, which belongs to the technical field of building construction and comprises a support plate, a hanging plate, asliding rail and a cable fixing part. The support plate comprises a bottom plate and a vertical plate, multiple hanging plates are horizontally fixed to the side wall of the vertical plate, and sliding rails are fixed to the upper portions of the hanging plates; tooth-shaped protrusions are symmetrically arranged on the two transverse inner side walls of the sliding rail. A plurality of sliding pieces are mounted in the sliding rail; the sliding piece comprises a rotating frame, a first rotating rod, a second rotating rod, a third rotating rod and a fourth rotating rod, a reset spring is connected between the first rotating rod and the third rotating rod, the movable end of the first rotating rod and the movable end of the third rotating rod are provided with connecting pieces matched witheach other respectively, a reset spring is connected between the second rotating rod and the fourth rotating rod, and the movable end of the second rotating rod and the movable end of the fourth rotating rod are provided with connecting pieces matched with each other respectively. The fixing device solves the problem of stably fixing the cable outdoors, and is simple to operate and convenient touse.