Abstract: The Yinjiapuzi cobalt exploration area is located within the Liaoning-Jilin orogenic belt, with the cobalt ore bodies hosted in the magnetite pyrite biotite tourmaline granulite of the first member of Lieryu Rock Formation, Liaohe Rock Group. Based on the exploration results and regional geological background, this study discusses the characteristics, mineralization process, and metallogenic age of Yinjiapuzi cobalt deposit. The zircon U-Pb dating of diorite porphyrite dikes cross-cutting the cobalt ore body, combined with previous data, indicates that the sedimentary mineralization of cobalt in Lieryu Formation possibly occurred during 2.09-2.19 Ga, while the regional metamorphism and deformation possibly took place in 1.85-1.95 Ga. The formation and metamorphic ages of Paleoproterozoic diorite porphyrite reported in this study has enriched the record of Paleoproterozoic magmatic activity and metallogenic sequence of cobalt deposits. Furthermore, the study identifies diorite porphyry veins as a significant prospecting indicator, which may provide references for cobalt exploration in the Liaoning-Jilin orogenic belt.