An object of the utility model is to provide a compact way of distillation sea water desalination device, include feed -tank, water -feeding pump, evaporimeter, condenser, congeal the water tank, congeal the water pump, the water -feeding pump is connected through taking over for pump inlet to the feed -tank, the water -feeding pump passes through the water -feeding pump export and takes over connection water feeding pipe, water feeding pipe passes through evaporimeter feed water inlet and takes over the connection evaporimeter, it takes over to set up steam inlet on the evaporimeter, the evaporimeter passes through flash steam and takes over connection water condenser, congeal the water tank and connect water condenser, congeal the water pump and pass through fresh water pipeline connection water tank with fixed attention, congeal the water pump and connect water pump export takeover with fixed attention, it takes over with three -way mode qualified water export pipeline of connectionand unqualified water export pipeline to congeal the water pump export, set up the solenoid valve in tee bend department. The utility model discloses having cancelled the vacuum and having taken outexcept that ware and dredge pump, made the system architecture simplify, operation, maintenance operations are more simple and convenient, not only reduce the sea water desalination device volume, andsimultaneously, the reliability of device improves greatly.