Based on the accuracy of coal blending in coking process will directly affect the product quality, improving the accuracy of coal blending is of great significance to reduce the cost of coke, in view of the problems existing in the automatic coal blending system of Hebei Fengmei Coal Coking Corporation Ltd., such as large moisture content of single coal, material blocking at the feedingport, frequent use of air cannon, belt deviation and unstable control of coal blending proportion, the system and process were improved, that is, the moisture content of incoming coal was controlled, the proportion of coal blending was optimized, the feedingport and the belt width of the electronic scale was reformed, the number of belt deviation was reduced, and the equipment management was strengthened. After improvement, the volatility of sulfur content of coal in furnace was reduced from 11.71% in 2019 to 3.97% in 2020. The accuracy of coal blending was effectively improved, and the economic income was increased by about 76 000 yuan.