The invention relates to a peeling-up polyolefin/organic clay nanometer composite material with high clay content, a preparation method and an application, belonging to the polyolefin/organic clay nanometer composite material technical field, wherein referring to polyolefin, the nanometer composite material comprise clay of 0.01-20 parts by weight, polyolefin substrate of 80-100 parts by weight and functional organic surface modifier of 0.005-8 parts by weight, the clay layer is peeled and uniformly dispersed in polyolefin substrate. The invention designs a heat resistant functional organic surface modifier to directly anchor active center in the clay layer, and accurately controls the position and amount of catalyst, via polyolefin to prepare the full peeling-up polyolefin/organic clay nanometer composite material with high clay content, with wide application for preparing vehicle elements, agriculture film, food package, sport goods and electric appliance or the like.