Length-adjustable pipeline support

The length-adjustable pipeline support comprises an adjusting assembly, and the adjusting assembly comprises a base, two limiting grooves, a limiting hole, two sliding seats, a pull rod, a lifting seat, four positioning columns, a handle, four through holes, a sliding groove, four limiting columns and a spring. The pull rod is pressed downwards through the handle, the lifting base moves downwards along the limiting column in the sliding groove, meanwhile, the lifting base drives the positioning column to move downwards and break away from the limiting hole, then the lifting base is driven by the pull rod, the lifting base drives the sliding base to slide in the limiting groove, and the sliding base drives the arc-shaped limiting plate through the supporting base. Further, the length of the bracket can be adjusted according to mounting requirements; and after the length is adjusted, the handle is loosened, the lifting seat drives the positioning column to be inserted into the limiting hole under the pushing of