NOVELTY - An acidic zinc single liquid flow energy storage battery is a galvanic pile, in which battery monomers capable of filling up electrolyte by pumping or emptying electrolyte by gravity effect are connected in series. The battery monomer comprises zinc-deposited compound electrode as cathode, low-acidic resistant lead dioxide as anode, compound acidic zinc sulfate with slow etching effect as electrolyte, electrolyte storage tank, conveying pump and related pipeline.    USE - Acidic zinc single liquid flow energy storage battery.    ADVANTAGE - The acidic zinc single liquid flow energy storage battery is economical and enables large-scale energy storage, without requirement of cationic film, and has high voltage efficiency and volume efficiency, and improved energy efficiency, simple battery structure, and reduced self discharging coefficient.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) compound cathode of electrical deposition zinc, which is obtained by using electrode containing electrode base component with corrosion resistance and low hydrogen separating rate, and electrical deposition layer, electroplating the surface with lead (0.005-0.02 mm), electroplating the surface with lead-indium-tin-copper alloy, subjecting the three base component materials are provided in compound acidic zinc sulfate electrolyte with slow etching effect, and electrically depositing electrolytic zinc layer (0.5-3.5 mm). The electrode base component contains lead-containing brass alloy as substrate material, which has zinc, copper and lead in the weight ratio of 30:65:5. The weight ratio of components in the coating layer is 85:2:9:4;    (2) low-acidic resistant lead dioxide, which has ( alpha )-lead dioxide as main component and ( beta )-lead dioxide as auxiliary component. The ( alpha )-lead dioxide is obtained by anode electrical deposition or sodium hypochlorite oxidization of lead hydroxide or lead oxide in the basic sodium hydroxide solution. The content of ( alpha )-lead dioxide is 45-95 weight% of the anode active substance. The content of ( beta )-lead dioxide is 5-45 weight% of the anode active substance;    (3) compound electrolyte, which is compound aqueous solution of sulfuric acid, zinc sulfate and multi-element additive. The concentration of sulfuric acid in the electrolyte is 10-50 %mass. The concentration of zinc sulfate is 0.1-15 %mass. The concentration of multi-element additive is 0.02-5 %mass; and    (4) multi-element additive, which is mixture containing inorganic additive and organic additive. The inorganic additive is bismuth sulfate, indium sulfate, tin sulfate and/or manganese sulfate. The concentration of inorganic additive is 0.01-4.99 %mass. The organic additive is citric acid, diphenyl ether-3, gelatin and/or amine triacetic acid. The concentration of organic additive is 0.01-4.99 %mass.