This paper introduces the current situation of over-diameter limestone in the receiving pit of the cement plant, puts forward the overall design scheme of the limestone over-diameter treatment system, and introduces in detail the composition and identification analysis process of the image recognition system. The limestone particle size is detected by image recognition technology. While identifying the oversized bulk materials, the particle size data can guide the mining and crusher production, effectively solve the problem of oversized limestone blocking in the receiving pit, and improve the cement enterprise's sophisticated management level.