Exhaust system and power system for vehicle and vehicle

The invention discloses an exhaust system for a vehicle and the vehicle, the exhaust system comprises an exhaust assembly, the exhaust assembly is provided with an air inlet and an air outlet, and the air inlet is suitable for being communicated with an air channel of a vehicle power device; and the air cooling device is arranged to be used for cooling the exhaust assembly. According to the exhaust system, the exhaust assembly can be cooled, so that waste gas is directly cooled, and the heat damage risk of high-temperature waste gas to surrounding parts is reduced.