NOVELTY - Seawater thermal energy desalination device comprises floating box, bent pipe, air turbine, vacuum pump, flash evaporator, condenser, temperature source drain pump, condensers, cold source pump, fresh water tank, fresh water drain pump, and several freshwater pipelines. The floating box is set with elbow having backend located below sea level and extending in sea front and port to connect with air turbine. The air turbine drives pumps, temperature source drain pump, cold source pumps, and freshwater drain pump.    USE - Seawater thermal energy desalination device.    ADVANTAGE - The seawater thermal energy desalination device has good mobility, and suitable for seawater temperature difference higher than 10 degrees C. It can fully contain seawater wave energy and apply temperature difference for seawater desalination. It has improved cost performance.    DETAILED DESCRIPTION - Seawater thermal energy desalination device comprises floating box, bent pipe, air turbine, vacuum pump, flash evaporator, condenser, temperature source drain pump, condensers, cold source pump, fresh water tank, fresh water drain pump, and several freshwater pipelines. The floating box is set with elbow having backend located below sea level and extending in sea front and port to connect with air turbine. The air turbine drives pumps, temperature source drain pump, cold source pumps, and freshwater drain pump. The floating box includes floating platform, which is provided with flash evaporator, condenser, water tank and several pipelines. The flash device is connected with fresh water pipeline, while temperature source drain pipe is connected with condenser. The flash evaporator through steam pipe is connected with condenser tube, which is further connected with water inlet pipe of cold source and cold source drainage pipe. The water tank is connected with condenser and fresh water drain pipe. The vacuum pump is connected with water tank. The temperature source drain pump is connected with flash evaporator temperature source drain pipe. The fresh water drain pump is connected with fresh water tank through fresh water drain pipe. The cold source pump is connected with condenser pump into water pipe. The cold source water inlet pipe is connected with water source pipeline. An INDEPENDENT CLAIM is included for method of desalting seawater by driving air turbine vacuum pump through bent pipe and using wave energy driving air turbine so that surface temperature source seawater under atmospheric pressure is sent through water inlet pipe into flash evaporator to make it into steam; driving cold source pump using air turbine to continuously sent cold source seawater into condensate pipeline to allow extraction of cold source seawater flowing through condenser tube; drawing cold source seawater into condenser under pressure difference of steam flash evaporator; storing condensed freshwater in fresh water tank; and draining out freshwater through drain pump.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of seawater thermal energy desalination device.