Abstract: Introduce the technology of high pressure briquetting of dry lignite,as well as the structure and working principle of large briquette-forming machine.With the help of this machine,the dry pulverized lignite could be processed into spherical briquette which has certain particle size and density.During the drying process,massive pulverized coal is generated,this increase the storage and transport cost.The machine can save energy and reduce consumption,help to improve the economic benefits,broaden the application range of lignite.