Abstract: The invention discloses an energy-saving and environment-friendly anti-freezing solution for a water system engine, which includes calcium chloride anti-freezing solution and alcohol-type anti-freezing solution. N-methyl pyrrolidone and allyl glycidyl ether are added into the calcium chloride anti-freezing solution and the alcohol-type anti-freezing solution. With the energy-saving and environment-friendly anti-freezing solution for the water system engine, when the water system engine gets into the best operating state, rapid cooling down and heat dissipation can be achieved. When the temperature is low, rapid heating-up can be achieved. Thus, the temperature of the engine is kept in constant and stable state, so that the engine can perform the combustion sufficiently to convert the thermal energy into power. The purposes of saving oil, improving power, reducing emission, saving energy, and protecting the environment are actually achieved.