1. Pre-press first, spread a textile bag on the appliance, put in a proper amount of walnut kernels, pack the walnut kernels into small bags (5 kg per bag is the most suitable), and put the wrapped walnut kernels into a special mold (the mold has many holes for oil supply, and the mold should have a suitable thickness and can withstand a certain pressure), and each layer of materials should be separated by thin iron sheets to facilitate oiling between materials. Then pressurize, and when the pressure rises to 4 MPa, start oil production; When the pressure rises to 10 MPa, little walnut oil flows out and can be discharged under pressure. The key is that the smaller the package, the higher the oil yield; Pressurization should be less and more frequent, and it should not be too high at one time, otherwise the oil will be easily sprayed out of the slurry or the oil flow passage between the oils will close and contract, and the oil production will decrease. In the whole process of oil extraction, walnut kernel is not heated and has no thermal denaturation. Walnut oil is light and bright, and the oil yield is about 32% of the kernel weight. The walnut cake is semi-degreased, loose, and has the inherent fragrance of walnut, and the protein is unchanged, which is convenient for the development and utilization of walnut protein. 2. The crushed and squeezed walnut kernel has changed its structure due to the action of external force, and then it is processed by a crusher and broken into small pieces, which is beneficial to rolling blank. It is required that the fineness is small and the particle size meets the conditions of billet rolling, which is convenient for the billet rolling machine to eat. 3. Slab rolling is a very important technological process, which directly affects the leaching effect. The crushed walnut kernel blank has a certain tough appearance structure and low pulverization degree, which is suitable for extraction conditions. In the extraction process, the solvent easily penetrates into the meal, and the residual oil in the meal is low. 4. The nature of solvent leaching at low temperature determines that the extractor is a tank extractor, and its feeding amount is about 65%, and the ratio of material to liquid is 1: 1. The leaching and desolventization of materials are carried out in the same equipment. The obtained walnut oil is light yellow, its residual solubility in oil is below 50mg/kg, the cake is white, its residual oil is below 3%, and its residual solubility is below 400mg/kg. Effective substances (vitamins, bioactive enzymes, etc. ) crude oil and meal are basically not destroyed.