The utility model discloses a cleaning device for an ozone catalytic reaction kettle. The utility model belongs to the field of cleaning devices, the utility model discloses an ozone catalytic reaction kettle cleaning device. Wherein the end part of the main rod is connected with a main cleaning head; a storage groove is dug in the end, away from the main cleaning head, of the main rod. An auxiliary rod is arranged in the storage groove; one end part of the auxiliary rod is connected with an auxiliary cleaning head; one end of the auxiliary rod away from the auxiliary cleaning head is connected with a connecting cover plate; a first through hole is formed in the side end, away from the main cleaning head, of the main rod; a locking mechanism is arranged at the first through hole; the locking mechanism comprises a positioning rod, a fixing block and a limiting screw block; the fixed block is positioned outside the main rod and is fixedly connected with the end part of the positioning rod; the ozone catalytic reaction kettle cleaning device has the advantages that the ozone catalytic reaction kettle cleaning device is simple in structure, dirt at different positions of the reaction kettle can be conveniently cleaned, and the ozone catalytic reaction kettle cleaning device is convenient to carry and store.