NOVELTY - The system has a distillation water storage tank (1) whose liquid outlet pipe is connected with a liquid inlet of a liquid mixing tank (5). The distillation water storage tank is equipped with a distillation water control valve (3). The distillation water control valve, an electrolyte control valve (4), a mixing liquid control valve (6), a concentration sensor (8) and a capacitance sensor (9) are electrically connected with an electric control unit. The distillation water storage tank stores distillation water. The electrolyte storage tank stores high concentration electrolyte.    USE - System for automatically protecting a lead-acid storage battery of a vehicle.    ADVANTAGE - The system maintains a storage battery in a simple manner so as to prolong service life of the storage battery, improve quality of the storage battery and reduce storage battery discharge circuit quantity. The system is inexpensive. The system utilizes a detection alarm sub-system for monitoring battery external climate environment, internal electrolyte concentration and storage capacity so as to prevent the storage battery from being damaged due to air blockage. The detection alarm sub-system sends feedback information to the electric control unit for regulating storage battery electrolyte concentration and storage capacity so as to ensure optimal working state of the storage battery. The system eliminates storage battery electric capacity deficiency issue. The system saves frequent maintenance personnel cost and storage maintenance and replacement cost.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for automatically protecting a lead-acid storage battery of a vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a system for automatically protecting a lead-acid storage battery of a vehicle.    Distillation water storage tank (1)    Distillation water control valve (3)    Electrolyte control valve (4)    Liquid mixing tank (5)    Mixing liquid control valve (6)    Concentration sensor (8)    Capacitance sensor (9)