The present invention discloses a preparation method for special low-temperature resistant fluororubber. The method comprises: in a pressure resistant reactor, adding deionized water and special fluoroether carboxylate as a surfactant; after deoxidation of the reactor, performing heating and stirring; introducing vapor fluorine-containing monomers that comprises the following materials in percentage by weight: 20%-70% of vinylidene fluoride, 10%-40% of hexafluoropropene, 0%-70% of tetrafluoroethylene and 0%-40% of other selectable comonomer that is one of the monomers or a combination of more than one monomers selected from: perfluoro methyl vinyl ether, perfluoro ethyl vinyl ether, perfluoro propyl vinyl ether, fluoroethylene, ethylene, propylene, trifluoroethylene, chlorotrifluoroethylene, difluoro dichloroethylene, 3,3,3-trifluoropropene, and perfluoroalkyl ethylene; and then adding a free radical initiator to prepare the fluororubber, wherein the reaction temperature is controlled at 20-140 DEG C, and the reaction pressure is controlled at 1-50 atmospheric pressure, and the concentration of the special fluoroether carboxylate in the final emulsion product is 0.01%-3%.