The invention discloses an alkaline manganese cell anode additive and an addition method thereof. The anode additive is a mixture of mainly barium sulfate and barium hydroxide; the barium sulfate addition accounts for 0.5-7wt% of an anode, and the barium hydroxide addition accounts for 0.5-1.8wt% of the anode; the barium sulfate is a powder with a purity greater than 99.9% and a granularity of 100% passing through a 325 mesh screen, and the barium hydroxide is a powder with a purity greater than 99.9% and a granularity of 100% passing through a 325 mesh screen. The addition method of the anode additive is as below: directly mixing well the barium sulfate powder and the barium hydroxide powder additive with other anode active materials according to a certain ratio. According to the invention, barium sulfate powder and the barium hydroxide powder in a certain ratio are used as an additive to be mixed with active materials by mechanical stirring, and are mixed with potassium hydroxide electrolyte with a concentration of 40%. The prepared alkaline manganese cell has a longer working time compared with a prior cell prepared by using barium sulfate or barium hydroxide individually as an additive.