The invention discloses a sweating soldering positioning mechanism for a TV bracket, which includes a fixing rod, wherein a support base is fixedly mounted at the bottom end of the fixing rod; mounting fixing holes are uniformly formed in the support base; a first positioning mechanism and a second positioning mechanism are mounted on the fixing rod; the fixing positioning mechanism is positionedabove the second positioning mechanism, and includes a positioning fixing device and an adjusting device; the positioning fixing device is mounted above the adjusting device, and includes a positioning plate, an indicating rod, a limiting bearing, a threaded hole and a fixing threaded rod; fastening threaded rods are penetrated and inserted on the two sides of a positioning groove formed in the front end of the positioning pate in a threaded rotation manner; the limiting bearing is fixedly mounted at the end, far from the fastening threaded rods, of the positioning plate. During the use, the support rod needing welding can be quickly and accurately positioned and welded.