The present application relates to a hard-core and soft-shell toy building blocks set, comprising polycarbonate matrix having tenon on its top and several mortise holes on its bottom; the outside surface of said polycarbonate matrix is cladded with thermoplastic polyurethane elastomer rubber layer. Said hard-core and soft-shell toy building blocks set provided in the this embodiment unitizes both conventional hard and soft kinds of cordwood toy by cladding thermoplastic polyurethane elastomer rubber layer on the outside surface of polycarbonate matrix, learning strong points from both to overcome their weaknesses, it produces high bounce ability, high resistance to wearing, bending, high temperature and oxidation, particularly, it is well worth mentioning that the new product is nonpoisonous, non-absorption of water and oil, no harm to health of children.