This paper studies the craft of the biomass briquette solid molding fuel, and determines the overall layout of the small-sized wood-pellet briquetting production line with an annual output of 6000 tons. Based on PROFIBUS-DP field bus and S7-300PLC as the main station, the overall architecture is proposed and the detailed design is carried out of control system. By means of MCGS configuration software, the remote monitoring system of the upper computer is designed. Finally, the automatic operation of the briquetting production line is realized.