The invention discloses a solar unmanned boat for adjusting 
water temperature and relates to the field of unmanned boats and 
aquaculture. The unmanned boat comprises a boat body, a 
microprocessor, a propulsion module, a communication module, a 
GPS positioning module, a first temperature sensor, a power supply module, a 
refrigeration module and a 
solar module; the 
refrigeration module comprises a water pump, a cold liner, an 
evaporator, a direct-current compressor and a condenser, wherein the 
evaporator is a spiral 
copper pipe surrounding the cold liner; the 
solar module is arranged on the topof the boat body; the first temperature sensor sends a first 
water temperature signal of a 
water area to the 
microprocessor, a second temperature sensor sends a second 
water temperature signal in thecold liner to the 
microprocessor, the communication module is used for 
data transmission between the microprocessor and the upper computer, and the GPS sends a 
longitude and 
latitude value of the boatbody to the microprocessor. The invention also provides an adjustment method of the solar unmanned boat for adjusting the water temperature. The unmanned boat adopts the compressor for 
refrigeration,the efficiency of water refrigeration is improved, a flexible solar panel is laid, 
solar energy is collected and converted into 
electric energy, and 
energy consumption is reduced.