The invention belongs to the technical field of the coal chemical industry, and particularly relates to a method for removing pyridine base in mixed phenol. The method comprises the steps of: performing a first reaction of the mixed phenol and oxalic acid solution to obtain a first intermediate product; performing a second reaction of the first intermediate product and sulfuric acid solution to obtain a second intermediate product; performing a third reaction of the second intermediate product and potassium permanganate solution to obtain a third intermediate product; and after rectifying thethird intermediate product, obtaining the refined mixed phenol. According to the method, three substances of oxalic acid, sulfuric acid and potassium permanganate sufficiently take a synergistic effect and are mutually and progressively removed in a classified mode so as to obtain the refined mixed phenol; after rectification, purity of the refined mixed phenol can reach over 99.9%, and content ofthe pyridine base is smaller than 0.005%, so that quality of the product is improved; and the refined mixed phenol is stable in color and difficult to discolor. By the method, impurities in the mixedphenol, such as organic nitrogen, organic sulfur and the like, also can be removed. Moreover, the method is simple in production process, convenient to operate and easy to implement.