The invention relates to a preparation method of a pigment, particularly a preparation method of P.Y.183 permanent pigment yellow. The invention mainly aims to solve the technical problems that the preparation method in the prior art can not be used for directly preparing the P.Y.183 permanent pigment yellow, and the P.Y.183 permanent pigment yellow produced at present has the defects of poor color tone, low yield and the like. The method comprises the following steps: diazotizing 2-amino-2,5-dichlorobenzene sulfonic acid, coupling with 4-(4-sulfophenyl)-3-methyl-5-pyrazolone, carrying out after-treatment on the material, carrying out pressure filtration, drying, pulverizing, and finally packaging to obtain the finished product.