Method for preparing high-quality fuel oil from inferior crude oil

The invention discloses a method for preparing high-quality fuel oil from inferior crude oil. The inferior crude oil enters first and second reaction zones of a catalytic conversion reactor in turn to contact a catalytic conversion catalyst and respectively perform primary reaction and secondary reaction, and after a reaction product and a spent catalyst are subjected to gas-solid separation, the spent catalyst is stripped and scorched in turn and is returned to the reactor for recycling; the reaction product is separated to obtain propylene, light fuel oil, catalyzed wax oil and other products, wherein the catalyzed wax oil enters a hydrocracking device and is separated to obtain products such as gasoline, an aviation fuel, diesel oil, hydrocracked tail oil and the like; and the hydrocracked tail oil is circulated to the first reaction zone of the catalytic conversion reactor and/or other catalytic conversion devices for further reaction to obtain a desired product, namely the light fuel oil, and a byproduct, namely the propylene. By the method, a diesel cetane number is improved.