The application of pure organic binder can significantly improve the TFe mass fraction of finished pellets，and it is of great significance to study the pure organic binder pellets for ironmaking process. In this paper，fine-grained highgrade magnetite concentrate，organic binder JDOB-4 and Indian bentonite are used as raw materials to study the effects of organic binder and bentonite on the properties of high-grade pellets，and the law of microstructure change of pellets is analyzed by equipment of optical microscopy and scanning electron microscopy-energy dispersive spectrometer. The results show that when the addition of JDOB-4 is 0. 15% ，the falling strength of the fresh pellets is 6. 1 times/( 0. 5 m) ，and the compressive strength of the pellets is 2 290 N/P under the conditions of preheating temperature of 1 050 ℃，preheating time of 18 min，roasting temperature of 1 300 ℃ and roasting time of 21 min. With the increase of JDOB-4 addition，the compressive strength of the roasting pellets first increases and then decreases. When the amount of organic binder is too much，the internal pores of the pellets increase，and a highly porosity and loose microstructure are formed，resulting in a decrease in the compressive strength of the pellets. Compared with bentonite pellets，the roasting process of pellets with more organic binders needs to increase the roasting temperature and extend the roasting time to promote hematite crystallization，and then improve the compressive strength of the roasting pellets. The results can provide a reference for the production of high-grade oxidation pellets using domestic high-grade iron ore concentrate with pure organic binder.