Preparation method of 4-chloro-3,5-dimethylphenol

The invention discloses a preparation method of 4-chloro-3,5-dimethylphenol, which comprises the following steps: by using cupric chloride as a chlorinating agent and catalyst and chlorine as an oxidizer, reacting 3,5-dimethylphenol, cupric chloride, chlorine and hydrochloric acid at 90-120 DEG C for 4-8 hours, and after the reaction finishes, rectifying the product to obtain the 4-chloro-3,5-dimethylphenol. The method does not use any solvent in the reaction process; the purity of the rectified 4-chloro-3,5-dimethylphenol can reach 99% or above, and thus, the rectified 4-chloro-3,5-dimethylphenol can satisfy the quality requirements of the industry; the components have favorable separating effects; the unreacted 3,5-dimethylphenol can be reutilized; and the method can easily control the utilization ratio of the 3,5-dimethylphenol through the reaction conditions, and can easily implement industrialization.