The utility model relates to a motor vehicle exhaust spark arrester, which is a safe fire-proof and fire-retardant device installed behind the exhaust pipe of an internal combustion engine, allows the exhaust flow to pass through, and can prevent the flame in the exhaust flow and the eruption of sparks. The product performance conforms to gb13365-2005. It is an important product to ensure the safety and fire protection of China's key fire prevention units and all transport vehicles in flammable and explosive areas It is applicable to inflammable and explosive key fire prevention units, warehouses, freight yards, oil fields, forest areas, coal mines, petrochemical liquefied gas plants, paper mills, airports and other fire prohibited areas. The installation of the product is very convenient and fast. Just put the open end of the product with the matching diameter specification with the clamping clamp on the exhaust pipe of the corresponding motor vehicle, and then tighten the nuts on both sides of the clamping clamp.