Method for improving yield of delayed coking liquid product

The invention relates to a method for improving a yield of a delayed coking liquid product. A liquid-increasing addition agent is added into a charged material of a coking tower; by taking the mass of raw oil as a standard, the adding amount of the liquid-increasing addition agent is 0.01-2%; the liquid-increasing addition agent contains 5-15 m% of acidified inorganic material, 5-15 m% of oil-soluble free radical initiator and 70-90 m% of dispersant; the acidified inorganic material is obtained by treating the inorganic material the Al2O3 mass content of which is not less than 15% by utilizing an inorganic strong acid solution, then drying, baking and crushing; the average grain diameter of the acidified inorganic material is not more than 300 microns; and the viscosity of the dispersant at 100 DEG C is not less than 30 mm /s. According to the method provided by the invention, the yield of the delayed coking liquid product is improved, the yield of the coke is reduced, and the distribution of the liquid product is improved.