The invention discloses a wide-area power network hierarchical protection and control system. The system comprises an acquisition control layer unit and a network protection layer unit which communicate with each other, wherein the acquisition control layer unit comprises an instation local data acquisition and control device, interstation remote data acquisition and control device and an instation onsite protection control device; and the network protection layer unit comprises two-layer protection of an interstation rapid differential protection device and an interstation and interstation time-delay differential protection device. The system has the following advantages: the system realizes hierarchical protection and control of a wide-area power network, enables instation protection control and wide-area protection control to form systematic cooperation, realizes rapid recovery of power supply and ensures power supply reliability.