The invention relates to a method for producing a fine-quality diesel oil blending component by using waste plastic pyrolysis oil, comprising the following steps of: firstly, measuring the density of the waste plastic pyrolysis oil at 20 DEG C; and then selecting different processing methods according to the size of the density. One method comprises the steps of: fractionating the waste plastic pyrolysis oil with higher density, and hydrogenating a heavy component obtained by fractionation to produce the fine-quality diesel oil blending component; and the other method comprises the steps of: hydrogenating the waste plastic pyrolysis oil with lower density in a total cut fraction way, and fractionating hydrogenated product oil so that an obtained hydrogenated heavy component is the fine-quality diesel oil blending component. The two processing methods can be realized by one set of device equipment, have good flexibility of practical operation and can flexibly switch processing procedures according to practical production needs; and in addition, the invention has the advantages of relative simple procedure, mild process condition, easy operation and low equipment investment and operating cost.