The original limestone crushing system of a 5 000t/d cement production line employed a heavy-duty plate feeder and a double-rotor hammer crusher. However, it suffered from low hourly output and large particle size of crushed materials. To address these issues, technical modifications included installing a five-roller screening machine between the heavy-duty plate feeder and the crusher, replacing the original crusher with a new double-rotor hammer crusher, and adjusting the feeder through elevation, truncation, and repositioning. These improvements reduced the crusher grate gaps, increased the hourly output to 1 200t/h, significantly decreased the particle size of crushed materials, enhanced equipment stability, and extended the service life of spare parts. Post-reform, the vertical mill’s hourly output rose from 390t/h to 410t/h, grinding power consumption decreased by 1.30 kW·h/t, and annual savings in electricity, labor, and spare parts costs reached approximately 1.192 million yuan. The investment is expected to be recouped within three years, demonstrating notable success. Further consolidation and enhancement of the technical outcomes can be achieved through meticulous planning of retrofit locations, strengthened collaboration between equipment manufacturers and construction teams, continuous optimization of equipment performance, and enhanced employee training and technical support.