Cathode oxygen cycle-based fuel cell heat and power cogeneration system

The invention discloses a fuel cell heat and power cogeneration system based on cathode oxygen circulation, which comprises a fuel cell, an anode gas supply module, an anode tail gas circulation module, a cathode gas supply module, a cathode tail gas circulation module and a circulating water heat exchange module, the anode gas supply module, the anode tail gas circulation module, the cathode gas supply module and the cathode tail gas circulation module are all connected with the fuel cell, the circulating water heat exchange module comprises a first heat exchanger, a second heat exchanger and a third heat exchanger, and a heating medium channel of the first heat exchanger is connected to an internal circulating water system of the fuel cell in series; a heating medium channel of the second heat exchanger is connected to the cathode tail gas circulation module in series, and a heating medium channel of the third heat exchanger is connected to the tail gas exhaust port. According to the invention, heat energy