The invention discloses an integrated water processor and the using method, belonging to the water treatment field, which is characterized in that a body is welded with a flange A, an inlet and an outlet, a blowdown pipe AB, a filter cylinder, a high frequency water processor, a compound filter body and a filter plate, but movably connected with a waterway control valve; the filter cylinder, a sewage collecting device and a blowdown pipe B are welded; the blowdown pipe A, a non-return valve, the blowdown pipe B and a flange of the blowdown valve are connected; the cover body is welded with the flange B and the baffle board; the flange AB is fastened; the cover body is insulated form the electromagnet body vessel. With the integrated water processor used, the sewage is processed as the following: with the waterway control valve arranged vertically, the sewage passes through the body and is filtered by the filter cylinder, and then drained through the sewage collecting device, the sewage collecting pipe B and the valve, while the filtered water is drained through the high frequency water processor and the compound filter body 2, afterwards, a backflushing is conducted; with the waterway control valve arranged horizontally, the water is filtered and drained through the filter plate to backflush the compound filter body, while the filth is drained through the blowdown pipe A, the non-return valve, the blowdown pipe B and the valve; the filter cylinder is backflushed with water, and the filth is drained through the sewage collecting device, the blow-off pipe B and the valve. The water treatment, the optimization and the backflushing are integrated.