The invention discloses a CO2
heat pump device. The CO2
heat pump device comprises a compressor, a
gas cooler, an oil
heat exchanger, a first filter, a throttling device, an
evaporator and a gas-liquid separator which are sequentially connected to a main heating circulation pipeline. The CO2
heat pump device further comprises an
ice melting circulation pipeline, the compressor, a third filter, a second
electromagnetic valve, the
evaporator and the gas-liquid separator, wherein the compressor, the third filter, the second
electromagnetic valve, the
evaporator and the gas-liquid separator are connected to the
ice melting circulation pipeline. When the bottom of the evaporator is frozen, the second
electromagnetic valve is switched on, high-temperature and high-pressure CO2 gas enters an independent pipeline on the lower portion of the inside of the evaporator via the third filter and the second electromagnetic valve from an outlet of the compressor, an ice layer at the bottom of the evaporator can be molten, then generated heat CO2 steam returns to a gas return opening of the compressor via the gas-liquid separator, and thus
ice melting circulation of the CO2 heat pump device can beformed. The CO2 heat pump device can operate at a low environment temperature, rapid ice melting can be achieved and heating operation of the
system is made stable.