The invention discloses a production method for dithiocyano-methane. The dithiocyano-methane is prepared by condensation of sodium sulfocyanate and methylene dichloride in medium water and a sealed reaction kettle, and the production method comprises the steps of synthesis, crystallization, filtration, washing, secondary filtration, product refining, drying and the like. The production method has the advantages that the dithiocyano-methane produced by the method has high content, low loss rate, low production cost and wide application.