The invention provides a method for preparing desulfurized fluororubber micro powder from waste fluororubber. The method has characteristics of adopting post cured waste fluororubber as a raw material, mechanically shearing and milling at normal temperature, and meanwhile, desulfurizing and ultrafine grinding the waste fluororubber, wherein the gel content is 75-85% and the particle size range is 0.2-80mu m. The desulfurized fluororubber micro powder provided by the invention can be used for preparing sealing elements, rubber tubes, rubber mats, tuber belts, outer sheaths of guide lines and linings of anticorrosive equipment by partially or completely replacing the raw fluororubber.