The high temperature calcined aluminum oxide powder is calcined into a crystalline type alpha-type alumina product at a suitable temperature; calcined by calcined α-type alumina as a raw material, produced by ball milling Alumina fine powder. High temperature calcined aluminum oxide powder has a high melting point, excellent mechanical strength, hardness, high resistivity, and thermal conductivity. It can be widely used in electronic equipment, structural ceramics, refractory materials, wear-resistant materials, polishing materials, and other industries.