Preparation method of methyl tin mercaptide

The invention belongs to the technical field of preparation of methyl tin mercaptide, and particularly relates to a preparation method of methyl tin mercaptide, which comprises the following steps: S1, planing tin bricks with better quality into tin sheets, and putting the tin sheets into a reactor; s2, metal tin and a first catalyst are put into a reaction kettle, then chloromethane is introduced for halogenation, then a redistribution agent is added for a tinning reaction, distillation is performed, fractions with the gas temperature ranging from 150 DEG C to 230 DEG C are received, and then pure water is used for absorption to obtain a methyl tin chloride aqueous solution; the methyl vinyl chloride comprises dimethyl tin dichloride and methyl tin trichloride; and S3, adding the obtained methyl tin chloride aqueous solution into isooctyl thioglycolate, adding a second catalyst, carrying out a stirring reaction at a temperature of 5-15 DEG C for 0.2-0.4 h, adding an alkali liquor, carrying out a continuous s