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This invention discloses a high-alumina-doped single-crystal cathode material and its preparation method, belonging to the technical field of lithium-ion battery cathode materials. To address the problem in high-alumina-doped or multi-element-doped cathode materials that the high content of inert dopants leads to a sluggish lithium intercalation thermodynamic process and dopant segregation, easily forming numerous two-dimensional defects such as grain boundaries, twin boundaries, and phase boundaries, this invention prepares a high-alumina-doped Co-containing precursor, combines it with a lithium source and flux for a first-stage solid-state sintering to obtain the cathode material matrix, and then mixes it with a coating additive for a second-stage solid-state sintering to obtain the high-alumina-doped single-crystal cathode material. This invention can significantly improve the grain boundary structure of the cathode material, increase the degree of single crystallization and structural stability, and is suitable for high-voltage lithium-ion batteries.