The invention provides an engine energy-saving carbon-reduction efficiency improving assisting device. An
electrolytic cell in which pure water can be injected is formed in a vehicle and is electrically connected with a vehicle storage battery, and the
electrolytic cell electrolyze the injected pure water into
hydrogen and
oxygen after the storage batter supplies currents for the
electrolytic cell. The
hydrogen and the
oxygen are transmitted to an engine gas
inlet manifold and a fuel
pipe through a first
gas transmission pipe and a second
gas transmission pipe respectively, so that the
hydrogen and fuels are fixed to be supplied to an engine steam cylinder to be burnt, and the
oxygen is fed into the engine steam cylinder to assist burning through the gas
inlet manifold; or the oxygen and the hydrogen are transmitted to the engine gas
inlet manifold through the first
gas transmission pipe and a second gas transmission pipe respective and fed into the engine steam cylinder to be burnt after being mixed according to the set optimum proportion, and accordingly, energy-saving and carbon-reduction purposes are achieved.