Synthetic method of clethodim

Provided is a synthetic method of clethodim. The invention relates to cyclohexenone herbicide clethodim, namely, 2-(1-(((3-chloro-2-propenyl)oxy)imino)propyl)-5-(2-(ethylthio)propyl)-3-hydroxy-2-cyclohexene-1-one. A chain reaction is conducted on ethanethiol, crotonaldehyde, ethyl acetoacetate, ethylsuleenyl heptenone and propionyl chloride which serve as main raw materials and a trace catalyst to generate the clethodim. The synthetic method of the clethodim is green, environmentally friendly and high in economic benefit.