The invention discloses a flotation cell anti-corrosion method in a sulfur flotation technology. Stainless steel bolts are uniformly distributed in and welded with the interior of a stainless steel cell body and extend outside from the inner surface of the stainless steel cell body inward; drilled PP plates are fixed on the stainless steel bolts of the stainless steel cell body respectively and are compressed by screw caps respectively, and a gap between each PP plate and the inner wall of the stainless steel cell body is eliminated; a plastic cover cap sleeves the extension end of each stainless steel bolt and is welded with the PP plate to ensure that each stainless steel bolt is completely isolated from liquid in a flotation cell; and a gap between two adjacent PP plates is welded by adopting a double-wire PP welding bar to form a sealing structure. According to the flotation cell anti-corrosion method in the sulfur flotation technology, the PP plates are adopted to transform the original 316L stainless steel flotation cell to be of a double-layer structure, and liquid in the cell is in contact with the PP plates only, so that the stainless steel cell body can be completely avoided from being corroded by chloride ions and the like in the liquid, the service life of the flotation cell is greatly prolonged, the maintenance frequency is lowered, and the whole method for realizing corrosion resistance is simple and is very low in cost.