The invention discloses a purification method for ultraviolet absorbent 2,4-dihydroxy benaophenonel, which belongs to the production field of light stabilizer. The purification method for the ultraviolet absorbent 2.4-dihydroxy benaophenonel comprises the following steps of: (1) putting 2,4-dihydroxy benaophenonel into a distillation flask, heating and dissolving; (2) opening a vacuum pump, regulating the vacuum degree to 1-150pa, finishing distillation after the distillation temperature is lowered, and obtaining a 2,4-dihydroxy benaophenonel crude product; (3) adding solvent into the obtained 2,4-dihydroxy benaophenonel crude product, wherein the solvent is mixed solvent which is prepared from methylbenzene and methyl alcohol at the weight ratio of 4:1, and the ratio of the weight of the added mixed solvent to the weight of the crude product is (3:1)-(6:1); heating and insulating the obtained mixed solution; taking conduction oil of 150-155DEG C as coolant to cool and recrystallize; and drying. The product obtained with the purification method disclosed by the invention has the advantages of high content and good appearance and chroma. Combined purification is carried out by distillation and recrystallization instead of decoloring treatment, the trouble that a pipeline is likely to block because of filtering while being hot is solved, and therefore industrial production is easy to carry out.