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This invention discloses an organocobalt salt for improving the tensile strength of rubber and its preparation method, belonging to the field of rubber technology. The organocobalt salt for improving the tensile strength of rubber comprises, by mass parts, 140-210 parts of organosilicon vegetable fatty acid, 20-30 parts of solvent, 20-30 parts of cobalt hydroxide, and 10-16 parts of propionic acid. The organosilicon vegetable fatty acid is obtained by reacting rosin with organosilicon maleimide. The organosilicon maleimide is obtained by reacting maleic anhydride with a silicon-containing long-chain fatty amine. The silicon-containing long-chain fatty amine is obtained by reacting methyldiethoxysilane with an unsaturated long-chain fatty amine. The organocobalt salt obtained by this invention has a good effect on promoting the adhesion between metal and rubber while effectively improving the tensile strength of rubber.