A smart electronic float includes: an accelerometer, sensing a movement distance, a movement velocity, movement power, and a sinking gravity of the smart electronic float in water, to produce a corresponding plurality of pieces of float movement data; a microcontroller, receiving the float movement data sensed by the accelerometer; a first wireless communications device, where the microcontroller transmits the float movement data to an electronic device through the first wireless communications device, and receives a light-emitting diode (LED) on/off signal from the electronic device; and an LED, where on/off of the LED is controlled by the microcontroller according to the LED on/off signal.