The work aims to improve the automation of the production line to increase the efficiency of spike finishing and packing. An automatic finishing and packing system of spike was developed. The system adopted the scheme of differential conveyor belt separation to realize the finishing and separating of spike. According to the actual requirements of spike packing, appropriate Delta industrial robots were selected to complete the packing. Based on Flexsim simulation software, the simulation and optimization of equipment and temporary storage area before and after balance of production line were completed. An automatic spike finishing and packing line was designed. Through balance analysis and balance operation of the production line, the average utilization rate of the mechanism with low utilization rate increased to 83.71%, the maximum stock of each temporary storage area tended to stabilize, and the standard deviation decreased from 785.73 before balance to 17.37 after balance. The production line of spike finishing and packing can effectively improve the production efficiency and reduce the production cost.