The invention discloses a small light unmanned aerial vehicle with excellent heat dissipation performance. The small light unmanned aerial vehicle is characterized in that an electronic speed controller component is mounted in a vehicle body dynamic nacelle and comprises an electronic speed controller mounting panel, thermal conductive silicone rubber, an electronic speed controller and an electronic speed controller mounting cover (with a ventilation opening in the side face), wherein the electronic speed controller mounting panel is fixedly adhered on lower skin of a vehicle body, the thermal conductive silicone rubber and the electronic speed controller are sequentially disposed above the electronic speed controller mounting panel, the electronic speed controller mounting cover and the electronic speed controller mounting panel are fastened, and the electronic speed controller mounting panel passes through upper skin of the vehicle body to be exposed over the ventilation opening after mounting. The small light unmanned aerial vehicle with the excellent heat dissipation performance has the advantages that the electronic speed controller is mounted in the vehicle body dynamic nacelle to make the temperature of a cavity in the unmanned aerial vehicle rise at a low rate, so that a good environment is created for a temperature sensor and other hardware in a flight control system in the vehicle body; (2) heat generated during operation of the electronic speed controller is brought away by airflow formed at the lower skin and the upper skin of the vehicle body during flight of the unmanned aerial vehicle, so that the service lives of components and parts of the electronic speed controller are prolonged and the use effects thereof are improved.