Roof-out pipeline flashing connecting structure

The utility model provides a flashing connecting structure for a pipeline out of a roof. The flashing connecting structure comprises a roof foundation, a hole, the pipeline, a steel ferrule, connecting angle steel, a base plate, a pipe hoop, a flashing cover, a sealing rubber layer and a supporting frame. The short edge of the connecting angle steel is welded and fixed to the steel ferrule, the long edge of the connecting angle steel is fixed to the roof foundation through an expansion bolt, and a base plate is additionally arranged between the surface of the long edge of the connecting angle steel and the expansion bolt to reinforce connection. The top of the flashing cover is fastened on a pipeline and is provided with a sealant layer for sealing treatment, the middle part of the flashing cover is a circle of downward slope surface, the slope surface covers the roof foundation, the bottom end of the flashing cover is a circle of vertical downward water drip structure with an L-shaped section, the water drip