Engine energy-saving carbon-reduction efficiency improving assisting device

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.