After the outbreak of African swine fever, China's pig production capacity rapidly declined. The supply and demand situation for pork was once tight with prices soaring all the way. As the main raw materials for pig feed, the prices of grains such as corn and soybeans also fluctuated accordingly. At the beginning of 2021, the epidemic was effectively controlled. The production capacity of live pigs was fully restored and the price of feed grains increased with the increase of feed demand. There must be a certain correlation between the prices of pig grains. This article focuses on analyzing the development characteristics of the pig grain industry and the equilibrium relationship between the fluctuation of pig grain prices. It also conducts research and judgment on the future supply and demand situation and price trends of pig grain. The study found that the pig price affects the grain price, and the grain price also affects the pig price. There is a certain Substitution effect for the grain price of different varieties. In the future, pork prices will change with the cyclical changes of pigs, but gradually stabilize. There will be a certain lag in the price changes of corn and soybean meal. The corn prices changing in the same direction as pig prices and soybean meal prices changing in the opposite direction. They both show relatively stable cyclical fluctuations.