The invention relates to the technical field of a battery, and especially relates to an alkaline battery additive. The alkaline battery addictive comprises the following components in parts by mass: 2-8 parts of yttrium oxide, 2-12 parts of yttrium hydroxide, 0.3-0.8 parts of a multi-cyano compound, 1.2-1.8 parts of lithium bis borate, 0.2-0.8 parts of potassium bromide, and 0.1-0.8 parts of a FS-3100 fluorine-containing nonionic surfactant, the mass ratio of yttrium oxide to yttrium hydroxide in the additive is 1:1-1.5, and the addition amount of the additive accounts for 0.5-0.8% of total weight of the battery. According to the invention, yttrium oxide, yttrium hydroxide, the multi-cyano compound, lithium bis borate, and potassium bromide as the additives are added in a battery cathode,a battery cathode or an electrolyte, proportioning is reasonable, battery internal resistance and gassing amount are reduced, new electricity performance and high-temperature storage performance of the battery are increased, and the effect is obvious.