In order to reduce the circulation of wet returns in the production process of pellet and improve the qualified rate of green pellets, two ways including improving the quality of green balls and stabilizing the composition of green balls particle size are started with, combined with such improvement measures as ball-making disc scraper modification, returning grinding and roller screen frequency conversion technology to study on improving quality and efficiency in grate-kiln-cooler pelletizing production systems. The results show that the modification of the fixed scraper of the pelletizing disc can reduce the circulation of wet returns in the production process, and the qualified rate of green balls can be increased by 4.78%; the low pressure grinding modification can improve the balling of the returns, promote the pass rate of green balls by 1.92%, and reduce the unit consumption of bentonite by 1.11 kg/t. The use of roller screen frequency conversion technology can improve the screening efficiency of green balls, promote the reduction of the return rate by 6.27%, and improve the compressive strength of the finished ball.