The Mengyin area of western Shandong Province is one of the important producing areas of primary diamond in China. This paper introduces the geological characteristics of kimberlite， reclassifies and renames different types of diamondiferous kimberlite in this area. Based on the principles of rock naming, three rock types, 13 subtypes of the fine- grained kimberley porphyrite, coarse- grained fine- grained kimberley porphyrite, and the clastic fine- grained or medium- sized fine- grained kimberley porphyrite were identified. At the same time, the intrusion sequence of the fine- grained kimberley porphyrite, the surrounding rock, angular fine- grained medium- sized fine- grained kimberley porphyrite, the coarse- grained fine- grained kimberley porphyrite is sequentially divided for the first time. Based on the comprehensive analysis of previous research data and field investigation， it is concluded that the previous metallogenic model of diamondiferous kimberlite in the Mengyin area is not consistent with the actual geological characteristics. The new metallogenic model of the Paleozoic Middle Ordovician diamond kimberlite in this area is the central fracture type compound subvolcanic crypto explosion with sequential magma intrusion filling. The magmatic intrusion in the breccia tube and its associated dyke and bed model are constructed.