Production method for dimethyl disulfide

The invention relates to a production method for dimethyl disulfide. The production method comprises the following steps: subjecting methyl mercaptan and strong base to reaction so as to generate methanthiol salt, and subjecting methanthiol salt and oxygen-containing gas to oxidation reaction so as to prepare dimethyl disulfide. The method provided by the invention combines a caustic soda liquid absorption method and an oxidation method to realize preparation of dimethyl disulfide, and has the advantages of small explosive range, basically no by-product, high product purity, high yield, etc.