The invention discloses an automobile exhaust pipe. The automobile exhaust pipe is connected with an engine. The automobile exhaust pipe comprises an exhaust pipe main body, a three-way catalyst, an air filter, a purifier and a silencer, wherein the three-way catalyst is connected with an air inlet of the exhaust pipe main body; the silencer is connected with an exhaust end of the exhaust pipe main body; the air filter is arranged in the position, close to the air inlet end, on the exhaust pipe main body; the air filter is adjacent to the three-way catalyst; and the purifier is arranged in the position, close to the exhaust end, on the exhaust pipe main body. Compared with the prior art, the automobile exhaust pipe has the advantages that the high-temperature gas is effectively prevented from being exhausted; the filtration effect is good; the structure is adopted, front and back cooling devices are arranged, exhaust gas exhausted by the engine is subjected to primary cooling through the front cooling device, the cooled exhaust gas is filtered through the three-way catalyst, and the filtered exhaust gas is changed into water through the back cooling device and is exhausted, so that air pollution is eliminated, and the environment is protected.