A light emitting diode driving circuit comprises a constant current circuit, a light emitting diode, a temperature sensor, and a micro-processor. The constant current circuit comprises an input end, a first output end and a second output end, wherein, the input end is connected with the micro-processor, the first output end is connected with the light emitting diode, and the second output end is connected with the micro-processor. The temperature sensor is adjacent to the light emitting diode and connected with the micro-processor, the temperature sensor senses the work temperature of the light emitting diode, correspondingly generates a present temperature signal and transmits the signal to the micro-processor. The micro-processor outputs a pulse signal with a certain duty ratio based on the relationship between the present temperature signal and a present driving current. The constant current circuit generates a driving current with corresponding magnitude based on the duty ratio to drive the light emitting diode.