The invention relates to a method for treating profenofos synthetic wastewater by using hydrogen peroxide, which comprises the following steps: after a proper amount of sulphuric acid is added to the wastewater to regulate the acidity of the wastewater, the hydrogen peroxide is added to the wastewater for heating reaction, bromide ions are oxidized into bromine, other organic matters are oxidized, the bromine is separated from the wastewater, and the wastewater from which the bromine is separated is neutralized; the temperature of oxidation reaction is 0 to 105 DEG C, sulphuric acid, hydrochloric acid, nitric acid, phosphoric acid or a mixture of the same can be added to the wastewater, the proper amount of acid is added for regulating the acidity of the wastewater until the concentration of hydrogen ions is 0.01 to 10.0 mol / L, the concentration of the hydrogen peroxide is 7 to 50 percent, the mol ratio of the hydrogen peroxide to the bromine in the wastewater is from 1:0.5-1:4, the hydrogen peroxide is added to the wastewater for reaction of 0.5 to 5.0 h, the wastewater introduced by a connecting pipe of a wastewater overhead tank and the hydrogen peroxide introduced by a connecting pipe of a hydrogen peroxide overhead tank are collected into an oxidation tower to for oxidation reaction, the upper end of a distillating tower is connected with a condensator by a pipeline, and a fine bromine output pipe is arranged after the condensation of the product of the oxidation reaction through a primary rectifying tower and a secondary rectifying tower. The invention has simple integral technology, good stability, high reliability and low operating cost.