The invention discloses a device and method for accelerating electrocatalytic oxidation degradation of organic pollutants. A traditional cuboid electrocatalytic reaction tank is taken as the basis, two sieve plates are arranged between a negative pole and a positive pole in the reaction tank, manganese dioxide particles are filled between the two sieve plates, and a vent pipe is disposed between the two sieve plates to introduce sulfur dioxide gas. While current is switched on, sulfur dioxide gas is introduced into to-be-treated wastewater, so that a part of organic matters can be degraded byMn<3+> generated by reaction in the solution, and oxidation reaction occurs to the other part of organic matters on the surfaces of electrodes, thus greatly speeding up the organic matter oxidation and saving electric power. In the whole reaction process, manganese dioxide is recycled and has no need for adding additionally. The device provided by the invention for wastewater treatment has the advantages of low energy consumption, mild conditions, high efficiency, recyclability and environmental friendliness.