The invention discloses a water life jacket with a light-emitting device, which comprises a life jacket and a light-emitting device fixed on the life jacket. The light-emitting device consists of an internal
wireless charging receiving module, a
wireless rechargeable battery, a light-emitting
diode, a
resistor, a light-emitting
diode drive circuit, a
system control circuit, a flexible circuit board, an externally encapsulated transparent rubber sleeve, a
humidity sensor, a
touch switch and a
wireless positioner, and is externally separated from a
wireless power supply module and a power supply; the flexible circuit board is fixedly provided with the wireless chargeable battery, the
resistor, and the light-emitting
diode which are connected and driven by the light-emitting diode drive circuit and are connected and controlled by the
system control circuit; the wireless chargeable battery, the
resistor, and the light-emitting diode are connected to form a light-emitting block or a light-emitting rod with a certain shape; the surfaces of the light-emitting block or the light-emitting rod are sealed by the externally encapsulated transparent rubber sleeve; the outside of the externally encapsulated transparent rubber sleeve is provided with the
humidity sensor which sends a trigger
signal when contacting water to start the
system control circuit so as to make the light-emitting device emit light. The water life jacket with the light-emitting device has the advantages of reliable
water resistance, convenient charging, small
power consumption and long light-emitting time.