The invention discloses an emergency treatment system for an unmanned aerial vehicle falling into water. The emergency treatment system for the unmanned aerial vehicle falling into the water comprisesan emergency treatment control plate connected with an unmanned aerial vehicle flight control module in a communication mode, and an underwater propeller and a falling-into-water detector which are correspondingly connected with the emergency treatment control plate, and further comprises a control plate power supply device and a propeller power supply device which are capable of providing a power supply for the emergency treatment control plate and the underwater propeller. According to the emergency treatment system for the unmanned aerial vehicle falling into the water, the emergency treatment function of the unmanned aerial vehicle after the unmanned aerial vehicle falls into the water is realized, so that the unmanned aerial vehicle after falling into the water floats on the water surface, meanwhile the attitude of the unmanned aerial vehicle can be adjusted, the front of the unmanned aerial vehicle can face upwards, inversion is prevented, the functions of navigation in the water and take-off again of the unmanned aerial vehicle can be further realized, the difficulties in the recovery process of the unmanned aerial vehicle are solved, and the economic losses are reduced.