The invention relates to a high oil-content oil material expanding prepressing leaching oil preparation method, which is characterized in that the method comprises the following steps, firstly, cleaning, cleaning oiling to remove impurities, secondly, tempering, adjusting the water content of oiling whose impurities are removed, thirdly, rolling slab, rolling oiling whose water content is adjusted into material slab, fourthly, squeezing and swelling, squeezing and swelling, the material slab, fifthly, drying, drying the material slab which is squeezed and swelled, sixthly, prepressing, prepressing the material slab which is dried to press one portion of oil, seventhly, leaching, leaching prepressed cake of the oil which is prepressed to get another portion of oil and meal from solvent extraction. A squeezing and swelling step in the invention is utilized to replace a cooking step in the existing method, which improves the quality and amounts of prepressing crude palm oil, increases handling capacity of a prepress expeller, and reduces power consumption and abrasion of a prepress expeller. The method of the invention is mainly applicable for oil preparation enterprises which utilize high oil-content oiling such as rapeseed and the like to be raw material.