The invention discloses a method of catalyzing hydrogen peroxide with molybdate-carried ion exchange resin to degrade trichlorophenol, which comprises the following concrete steps: taking a proper amount of resin, soaking the resin in deionized water, adding a NaOH solution and stirring the solution to convert the resin into an OH- type; in the reaction system, adding a certain amount of molybdate to 5g of OH- resin to obtain an Resin-Mo heterogeneous catalyst; in the reaction system, adding a sufficient amount of H2O2 to start the reaction; and in the reaction system, adjusting the pH value to 8-11 with the water solution of phosphoric acid and sodium hydroxide, under the reaction condition of reacting for 60 minutes at the temperature of 35-45 DEG C; and under the catalysis of the molybdate, degrading the trichlorophenol in the waste water with the hydrogen peroxide under the weak base condition. Under the optimal experiment condition, more than 95 percent of trichlorophenol can be degraded within 60 minutes.