The invention discloses a solar 
seawater desalination device, which comprises a 
vacuum tube type 
solar heat collector with cold and hot 
water tanks, a combined evaporative condenser, a 
seawater evaporator, a vapor condenser, a scroll 
vacuum pump, a 
heat pump circulation 
system, a 
fresh water tank, a strong brine tank, a 
sieve plate, a pressure reducing valve and the like. The device adopts the scroll 
vacuum pump to obtain higher negative 
system pressure to reduce the 
evaporation temperature of 
seawater; between the seawater 
evaporator and the vapor condenser, the 
heating cycle of a 
heat pump is utilized to supply the 
latent heat released by vapor condensation to the seawater 
evaporator and provide the heat for the 
evaporation of the seawater, and the device fully and effectively recovers the 
latent heat of condensation of 
water vapor; and the combined evaporative condenser is adopted to ensure that the seawater can be immediately condensed after the 
evaporation of the seawater and reduce the load of the 
vacuum pump. The device has the advantages of high efficiency, low 
energy consumption, compact structure, high 
fresh water yield and the like, and is suitable to solve the 
water drinking problem in water-deficient areas and the 
water drinking problem of operating personnel on ships and offshore platforms all year round.