Abstract: Engine Exhaust Purifier-Muffler comprising a box type body, a cylindrical filter connected to the exhaust pipe of engine is located at rear bottom conner inside the box, a plurality of perforated plate filter elements are stepwisely disposed inside the box to reach toward the top, under the ceiling, a filter of square cross section is further provided, after the said filter, an outlet section is provided to connect to an outlet pipe. Porous plastic material such as polyurethane foam is used as filter medium in all the abovesaid filters. Water is half filled within the box. The box is also provided with a water inlet, an overflow opening and a drain for discharge the water. Waste gas passes through water and filter elements discharged from the outlet contains much less hazardous components and is eliminated from noise.