The invention discloses a novel synthesis method for oxophenylacetate and belongs to the technical field of synthesis. The novel synthesis method comprises the steps: firstly, reacting benzonitrile and a halogenation reagent at 20-35 DEG C to obtain dihalogenated phenylacetonitrile; then, adding a mixed solution of acid and water into dihalogenated phenylacetonitrile at 35-55 DEG C, and carrying out a reaction at 50-60 DEG C for 2-8 h, wherein the molar ratio of a product I to the water to the acid is 1:(1-10):(1-10); and finally, adding alcohol into the reaction solution in the former step at50-60 DEG C, then, carrying out stirring, controlling the temperature at 60-70 DEG C, carrying out a constant-temperature reaction for 1-4 h, and carrying out cooling and extraction to obtain a target product. The reaction raw materials adopted in the method are wide in source and low in price, the operation process is simple, and the yield of the product is high.