The invention discloses a method for preparing carbon-coated manganese phosphate from a waste zinc-manganese battery. The method comprises the following steps: pretreatment, to be more specific, crushing and sorting the a waste zinc-manganese battery to obtain manganese dioxide; purifying to obtain a pure manganese solution; extracting with a bis(2,4,4-trimethylpentyl)-phosphinicacid saponification liquid of bis (2,4,4-trimethylpentyl) phosphonic acid to obtain bis(2,4,4-trimethylpentyl) phosphonate manganese; and performing high temperature oxidation catalytic decomposition to obtain the carbon-coated manganese phosphate. The method for preparing the carbon-coated manganese phosphate from the waste zinc-manganese battery realizes the recycling and high-end use of the waste zinc-manganese battery and simultaneously recycles zinc therein, the process is simple, and the waste water is less produced. The obtained manganese phosphate is carbon-coated manganese phosphate, has low impurity content, has a spherical structure, and has high tap density and narrow particle size distribution, and carbon content can be adjusted to control.