The by-product of corn germ oil extraction is corn germ cake. Generally, the product extracted by pressing method is called corn germ cake, and the product extracted by solvent extraction method is called corn germ cake. Oil production by leaching method is an advanced oil production method in modern times, with high oil yield and good utilization effect of oil meal. However, since corn embryos are generally separated from bag starch factories or other corn processing plants, up to 7 million tons of corn embryos can be produced per 10,000 tons of corn. When these germs are used to make oil, there are only more than 300 tons of products, which is a relatively small-scale oil processing, so the corn germ oil production part uses the squeezing method to make oil.