Industrial preparation method for clethodim

The invention discloses an industrial preparation method for clethodim. The industrial preparation method comprises the following step: by taking dichloromethane as a solvent, performing a reaction on 5-[2-(ethylsuleenyl) propyl]-2-propionyl-1,3-cyclohexanedione and chloroallyloxyamine, thereby generating clethodim. According to the industrial preparation method, a solvent is replaced, so that the reaction can be implemented at 20-25 DEG C in the absence of a catalyst, the energy consumption is saved, decomposition of clethodim is reduced, introduction of extra impurities is avoided, and the product yield and the content are increased.