The evolution of North China Craton (NCC) during the early Neoproterozoic period remains unclear or controversial due to limited exposures of Neoproterozoic tectonism and magmatism. In this contribution, we identified an early Neoproterozoic gabbro sill emplaced into the Agulugou Formation within the Zha’ertai Group in Guyang area, central Inner Mongolia in northern margin of the NCC. Zircon LA- ICP- MS U- Pb dating on three metagabbro samples yields emplacement ages of ~925 Ma, indicating existence of early Neoproterozoic mafic magmatic activities in the northern margin of the NCC. The early Neoproterozoic metagabbro sill in the Guyang area exhibits similar geochemical characteristics and overlapped Nd isotopic compositions to those of the ~925 Ma mafic dyke swarm (Dashigou dykes) in the central NCC and the 945~890 Ma mafic sill swarms (Xuhuai- Liaodong- Sariwon diabase sills) in the southeastern NCC. The ~925 Ma metagabbro sill emplaced into the Zha’ertai Group in the Guyang area is most likely the northwestern extension of the 945~890 Ma mafic magmatism in the central and eastern NCC. However, compared with the 945~890 Ma mafic magmatism in the central and eastern NCC that were considered to be related to breakup of the NCC from other continents in the Rodinia supercontinent, the areal extent and volume of the ~925 Ma mafic magmatism is very small, indicating that the northern margin of the NCC was far from the plume and breakup center during the early Neoproterozoic. Our identification of the ~925 Ma metagabbro sill in the northern NCC provides new evidence for Neoproterozoic evolution and involvement of the NCC in the Rodinia supercontinent.