Flat-shaped liquid-nitrogen and liquid-helium dual-media compatible heat sink device and cooling method thereof

The invention discloses a flat-shaped liquid-nitrogen and liquid-helium dual-media compatible heat sink device and a cooling method thereof, wherein the heat sink device comprises a heat sink body, heat sink surface resistance temperature sensors, an auxiliary drainage pipeline, a liquid nitrogen supply, a gas nitrogen blower, a gas helium blower and a liquid helium supply system; the heat sink body comprises a liquid-nitrogen heat sink, a liquid-helium heat sink and a framework; both the liquid-nitrogen heat sink and the liquid-helium heat sink are flat and round; the liquid-helium heat sinkis arranged at the inner side of the liquid-nitrogen heat sink; the heat sink surface resistance temperature sensors are evenly distributed on the surfaces of the liquid-nitrogen heat sink and the liquid-helium heat sink; the liquid nitrogen supply, the gas nitrogen blower, the gas helium blower, the liquid helium supply system and the auxiliary drainage pipeline are all connected to the inlet ofthe liquid-helium heat sin