The invention relates to an energy-saving type automobile tail gas exhaust pipe. The energy-saving type automobile tail gas exhaust pipe comprises an exhaust device, a secondary combustion device, a waste heat utilization device and a filtering device, wherein the exhaust device comprises a gas inlet pipe, a gas outlet pipe and a gas outlet tail pipe, the gas inlet pipe and the gas outlet tail pipe are located on the two sides of the gas outlet pipe separately, the internal diameter of the gas inlet pipe and the internal diameter of the gas outlet tail pipe are smaller than that of the gas outlet pipe, the gas inlet pipe and the gas outlet pipe are fixedly connected; and the gas outlet tail pipe and the gas outlet pipe are movably connected. Through cooperation of a burning torch and an oxygen supply pipe, waste gas insufficiently burned and oxygen are ignited while oxygen is conveyed in the air outlet pipe, accordingly, the waste gas is sufficiently burned in the gas outlet pipe and contains no unburned carbonic oxide or other unburned hydrocarbon when exhausted, and thus the effects that automobile waste gas is burnt more sufficiently, pollution to air is reduced and the environment-friendly performance is better are achieved