The invention provides zinc powder for alkaline zinc-manganese dioxide cells and a preparation method of the zinc powder. According to the particle diameter, the zinc powder consists of five parts, wherein the particle diameter of the first part is greater than 300mum, the particle diameter of the second part is in the range being 300mum to 150mum, the particle diameter of the third part is smaller than the 150mum but is not smaller than 105mum, the particle diameter of the fourth part is smaller than 105mum but is not smaller than 75mum, and the particle diameter of the fifth part is smaller than 75mum. The granulometric composition of the zinc powder for alkaline zinc-manganese dioxide cells is in uniform distribution, and the uniform distribution is different from the normal distribution of the zinc powder for the ordinary alkaline zinc-manganese dioxide cells; and the high-current discharging performance of the LR6 alkaline zinc-manganese dioxide cells obtained through preparation is improved by more than 30 percent than that of the ordinary zinc powder, and in addition, the intermediate-low current discharging is also increased by more than 5 percent.