Since the correlated insulating states and superconductivity in magic angle twisted bilayer graphene were discovered, the twisted moiré superlattice has attracted a wide range of research interest, and even has brought a new field, “twistronics”, into being. In this review, we first give a history of experimentally discovering magic angle graphene and flat band, and then summarize the recent developments of twisted moiré superlattice, including twisted graphene systems and TMDCs, and finally introduce a notion of moiré superlattice quantum simulator.