Under the condition of no oxygen-enriched sintering, the proportion of pre-sintering time to the thickness of the upper and lower layers of the double-layer burden is optimized and industrial tests were carried out in the early stage of this study, which helped the double-layer sintering greatly increase its production, and the sinter quality meet the requirements of blast furnace smelting. However, there is a problem of lower layer intensity differences in the double layer pre-sintering technique, thus a study of heat transfer of double layer pre-sintering and mineralization is carried out. The results show that the flue gas in the hot state of double-layer pre-sintering is completely different from that in the single-layer sintering, for its structure and properties are more complex; the reaction gas in the middle and lower part of the double-layer pre-sintering layer is the upper exhaust gas, and the oxygen content is low, which leads to the inadequate mineralization of sinter in some areas of the lower and middle part, and the structure of sinter is a little loose; the upper layer of double-layer pre-sintering has single layer sintering process, and the middle layer is a sinter belt formed by pre-sintering. The sintering process of the middle layer is the same as that of single layer, the lower layer and the upper layer are in the double-layer sintering process simultaneously. The heat transfer and mineralization behavior of the middle layer is completely different from that of the conventional single-layer sintering. The research work in this paper will provide theoretical support for the improvement of sinter quality in the double-layer pre-sintering process.