Preparation method for mixed-crystal type yellow disperse dye with controllable mixing ratio

The invention relates to a preparation method for mixed-crystal type yellow disperse dye with a controllable mixing ratio. The preparation method mainly comprises the following steps: reacting C.I. yellow disperse dye 54 with phthalic anhydride in excessive 2-methyl quinoline for 6-9 hours at 190-210 DEG C; after cooling to the environment temperature, performing simple solid-liquid separation to obtain a solid which is a target product. The preparation method not only has the characteristic that the mixing ratio of two component dyes is controllable, but also has the advantage that the production cost is relatively low.