The invention discloses a semi-solid preparation technology for a short fiber/SiCp enhanced foam aluminum-based bearing bush. The semi-solid preparation technology comprises the steps: adding a nano granulated TiH2 foaming agent, micron granulated SiC particles and short fibers which are prepared in advance into a micron granulated aluminum base body material, uniformly mixing to prepare a mixed material, and coating the inner wall of a die cavity of a semi-solid isothermal treatment device with an isolating agent; then heating the mixed material to reach a semi-solid region of the aluminum base body material through the semi-solid isothermal treatment device, and preserving the heat to form a semi-solid bearing bush blank; performing upsetting treatment on the bearing bush blank to improve the compactness of the bearing bush blank; finally, taking out the bearing bush blank subjected to upsetting treatment, and performing cooling and fine processing to prepare the short fiber/SiCp enhanced foam aluminum-based bearing bush. The bearing bush prepared by the semi-solid preparation technology has the advantages of light weight, high anti-seismic property, low friction, high toughness, high compactness and convenience for lubrication.