The invention relates to a stainless steel flat plate mold for tempered glass of an automobile. The mold has a square pipe frame structure and comprises a furnace body assembly hanger plate, a mold framework, a mold frame, a mold cloth frame and a flat mold, wherein the furnace body assembly hanger plate is connected with the mold framework; the mold frame is arranged below the mold framework; and the flat mold is arranged below the mold cloth frame. Compared with the prior art, the mold has the advantages of simple structure, a few used materials, convenient and fast processing and manufacturing due to the adoption of a general part, high stability due to the adoption of a square pipe frame bolt assembly structure, no unaccepted product due to a clean mold cavity without waste residues or sweeps, convenient and fast replacement of mold cloth and obvious improvement on production efficiency.