An AlPO<4>-5/gamma-Al2O3 composite material, a preparing method thereof and applications of the composite material are provided. The method includes fully mixing water, an aluminum source, a phosphorus source and a template to obtain AlPO<4>-5 molecular sieve slurry, mixing activated aluminium oxide that is gamma-Al2O3 and water, pulping to obtain activated aluminum oxide gamma-Al2O3 slurry, fully mixing the AlPO<4>-5 molecular sieve slurry and the activated aluminum oxide gamma-Al2O3 slurry to obtain a mixture, and subjecting the mixture to crystallization to obtain the AlPO<4>-5/gamma-Al2O3 composite material. The AlPO<4>-5/gamma-Al2O3 composite material prepared by the method and the applications thereof are also provided. The composite material is suitable as a carrier material for a diesel oil hydrofining catalyst. Original high strength, thermal stability, pore characters and surface properties of activated aluminum oxide are maintained, and a microporous molecular sieve with proper acidity is introduced to form the composite material to increase the specific surface area so that pore distribution of a composite carrier is more centralized.