Positioning and scribing support for pipeline cutting machining

The utility model discloses a pipeline cutting machining positioning lineation support and belongs to the technical field of pipeline machining. Comprising a base, a supporting column, a vertical rod, a horizontal rod, a rear sleeve, a rear screw, a front sleeve, a front screw, a sliding roller and a rolling shaft which are combined for use. The water supply pipeline is placed on the sliding roller of the positioning and marking support, then the overhanging length of the horizontal rod is adjusted according to the positioning and marking point of the water supply pipeline, and the rear screw is fastened so that the horizontal rod can be fixed. Then a marking pen is inserted into the front sleeve, the tip of the marking pen abuts against the upper surface of the water supply pipeline, the front screw is fastened, the marking pen is fixed, then the water supply pipeline is rotated on the sliding roller, and the marking pen marks a positioning line on the water supply pipeline. The positioning marking tool has