The invention relates to a clean fuel automobile. The clean fuel automobile comprises an automobile body, wheels, a storage battery, a generator, a speed changing and transmission mechanism and a power system, wherein the power system comprises a clean fuel storage tank, an assistant fuel gas storage tank, a mixer, a heat storage water tank, a clean fuel power unit, waste gas treatment equipment and a carbon dioxide absorption tank; the generator is connected with the clean fuel power unit by virtue of a shaft, and the clean fuel power unit is connected with a speed changer by virtue of a clutch; the clean fuel storage tank and the assistant fuel gas storage tank are connected to the mixer, the mixer is connected to the clean fuel power unit, and the clean fuel power unit is connected with the carbon dioxide absorption tank by virtue of the heat storage water tank and the waste gas treatment equipment. The clean fuel automobile, by virtue of the clean fuel power unit, utilizes pressure energy and chemical energy of fuel and the assistant fuel gas to do work, efficient utilization of clean fuel is realized, and power performance and efficiency of the automobile are improved.