Quantum Hall edge states are known to be an ingredient for realizing quantum excitation states such as Majorana fermions when coupled to superconductivity – a route toward quantum computation. However, quantum Hall often requires extreme experimental conditions of very low temperature and high magnetic fields, which hold it back from practical applications. We discovered a new van der Waal hybrid system in which an unusually robust quantum Hall phase is realized, due to the coupling between graphene and an interfacial charge order in CrOCl.