Heating and ventilation pipeline heat preservation structure

The utility model discloses a heating and ventilation pipeline heat preservation structure which is provided with two four-way half-type pipes, first heat preservation pads are attached to the inner pipe walls of the two four-way half-type pipes, the two four-way half-type pipes are directly and rapidly attached to a four-way drainage pipeline in the mode that inserting grooves and inserting strips are matched in an inserted mode, and detachable installation of the two four-way half-type pipes is completed through fastening bolts. The outer pipe wall of the four-way drainage pipe can be conveniently and rapidly wrapped with the warm-keeping pad, the second warm-keeping pad is attached to the inner pipe walls of the two butt-joint half-type pipes, the outer pipe wall of the drainage straight-through pipe is wrapped and installed through the two second warm-keeping pads along with splicing of the two butt-joint half-type pipes, notches are formed in the side edges of the two butt-joint half-type pipes, and ther