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In addition to the direct use of corn as energy feed, about 30% of the annual output is used to produce corn starch, sugar and ethanol and other deep processing products in China, while producing corn husk, corn pulp, corn embryo meal, corn protein meal, DDGS and other by-products. These by-products generally have problems such as high crude fiber content, low available energy, mycotoxin pollution, etc. If the quality and efficiency of these by-products are improved by processing technology, their feeding value can be significantly improved. In the paper, the nutritional characteristics, value-added processing and utilization technology of corn processing by-products and their application in animal production are reviewed, which can provide reference for the effective improvement of feed value, and also have important significance for alleviating the contradiction of feed resource shortage. [ABSTRACT FROM AUTHOR]