Method for preparing fuel from biological oil

The invention provides a novel method for preparing a fuel from biological oil. The method comprises the following steps: 1, allowing the biological oil to undergo a catalytic cracking deoxidation reaction under heating in the presence of a cracking deoxidation catalyst; 2, mixing products obtained in step 1 with hydrogen; and 3, allowing a mixture obtained in step 2 to undergo a catalytic hydrogenation deoxidation reaction under heating in the presence of a hydrogenation deoxidation catalyst. A clean fuel having components equivalent to components contained in fuels obtained through refining crude oil can be manufactured from a biological oil raw material through the method.