The invention relates to a high-energy zinc-manganese battery which comprises a steel shell, a positive pole ring, zinc paste, diaphragm paper, a sealing ring, a copper nail and a negative pole cover. The high-energy zinc-manganese battery is characterized in that a layer of carbon nanotube conductive paper is additionally arranged between the steel shell and the positive pole ring to be taken as a current collector of a positive pole. The high-energy zinc-manganese battery has the advantages that 1, the affinity between the positive material and the current collector can be improved, and the positive material is more closely contacted with the steel shell, so that electrons can be well converged together on the carbon nanotube conductive paper; 2, a carbon nanotube has a high liquid absorption property so as to be used for well storing electrolyte, so that more electrolyte can be stored in the zinc-manganese battery, and the reaction can be continuously carried out.