Adjustable LED lighting mounting bracket

The utility model discloses an adjustable LED lighting installation support which comprises an installation base, a fixing cylinder is welded to the upper end face of the installation base, an end cover is connected to the upper end face of the fixing cylinder in a threaded mode, a penetrating hole is formed in the upper end face of the end cover, and a sliding block is connected to the inner wall of the fixing cylinder in a sliding mode. A telescopic rod is fixedly connected to the upper end face of the sliding block, the upper end of the telescopic rod penetrates to the position above the fixing cylinder through a penetrating hole, a second connecting rod is welded to the upper end of the telescopic rod, and a first connecting rod is movably connected to one end of the second connecting rod through a second locking bolt; the outer side of the fixing cylinder is in threaded connection with a first locking bolt and a third locking bolt, and one end of the first locking bolt and one end of the third locking bo