Preparation method of o-ethoxybenzoyl chloride

The invention discloses a preparation method of o-ethoxybenzoyl chloride, and relates to the technical field of organic synthesis. The salicylic acid and the diethyl sulfate are used as initial reaction materials, the raw materials are low in price, the diethyl sulfate does not need an additional catalyst compared with halogenated alkane which is used as an ethylation reagent, the boiling point of the diethyl sulfate is high, and the reaction conditions are easier to control. In the reaction process, the steps of ethylation reaction, acidolysis, extraction, acylating chlorination and the like are sequentially carried out, the synthesis process is simple, convenient and feasible, the reaction conditions are mild, the requirements on production equipment are low, and the yield of the synthesis method is high; according to the method, the acylating chlorination reaction does not need to be carried out by using highly toxic phosgene, meanwhile, an expensive catalyst does not need to be used, the o-ethoxybenzoic a