With the increase of the proportion of hematite, limonite and other imported minerals, as well as the rapid development of domestic industry, economy, science and technology, the pelleting production of belt roaster will usher in a rapid development in China. The technology and production line of belt roaster, the material flow and energy flow are introduced and analyzed, while the development of the pretreatment technology of raw materials for high pressure roller mill, the new type of pelletizing binder, the optimization of ore proportioning and the preparation of magnesium pelletizing, the calcination thermal regulation and temperature control, as well as the numerical simulation and prediction are described in detail. In addition, the corresponding technologies are summarized and prospected in order to provide reference for further application of pelletizing technology of belt roaster and decision making for iron and steel enterprises.