Heat pump type small seawater desalting device

The invention discloses a heat pump type small seawater desalting device, which is power-driven and comprises a compressor, a gas jet air ejector, a condenser, a main evaporator and a water jet air ejector, wherein the compressor is used for providing high-temperature high-pressure refrigerant gas to the condenser; the gas jet air ejector is used for sucking and mixing gas generated by vaporization in the main evaporator and a secondary evaporator and providing the gas to the compressor; the condenser and the main evaporator are assembled in a common sealing cover; the condenser is used for evaporating seawater; a refrigerant outlet, a seawater inlet, a strong brine outlet and a steam outlet are also arranged on the condenser; the main evaporator is used for condensing steam to form fresh water; a fresh water outlet is also arranged on the main evaporator; the water jet air ejector is used for extracting strong brine and non-condensable gas in the sealing cover and generating and keeping the vacuum degree in