The invention discloses silicone rubber for sealing two ends of a heater. The silicone rubber comprises the following raw materials in parts by weight: 1-2 parts of 1,4-cyclohexanedimethanol, 0.4-1 parts of vanadium diboride, 3-4 parts of polypropylene powder, 1-2 parts of accelerant TT, 0.4-1 part of trithiocyanuric acid, 0.7-1 part of 2-mercaptobenzimidazole, 1-2 parts of 1-hydroxycyclohexyl phenyl ketone, 10-17 parts of superfine barium sulfate, 10-13 parts of bis(2-ethylhexyl)sebacate, 2-3 parts of calcium fluoride, 0.5-1 part of butyltin mercaptide, 3-4 parts of rare earth auxiliaries, 100-110 parts of methyl vinyl phenyl siloxane rubber, 1-2 parts of sulfur, and 0.2-0.5 part of tetrahydrofuran, wherein the rare earth auxiliaries are prepared by the following steps: fully melting magnesium-aluminum silicate and colloid formed by polyvinyl acetal under the condition of taking deionized water as a solvent, so as to form stable and high-viscosity colloidal state, adding the treated acidified rare earth into the high-viscosity colloidal state system to form stable rare earth colloidal liquid, and then mixing and modifying with the esterified zeolite. By adopting the rare earth auxiliaries, not only can the mechanical performance and surface resistance of the finished products be effectively improved, but also the compatibility of materials can be enhanced, the stability of the finished products can be improved, the volume wear can be reduced by rare earth, and the wear resistance of the rubber can be improved.