The invention discloses an LED controller and belongs to the smart home field. The LED controller comprises a main control chip, a hardware watchdog circuit, a wireless receiving module, an LED driving circuit, a power source module and a memory; the output end of the wireless receiving module is electrically connected with the wireless receiving input end of the main control chip; the input end of the LED driving circuit is electrically connected with the PWM output end of the main control chip; the memory is electrically connected with the storage interface of the main control chip; the first output end of the hardware watchdog circuit is electrically connected with the reset port of the main control chip; and the count clearing input end of the hardware watchdog circuit is electricallyconnected with the timing output end of the main control chip. According to the LED controller of the invention, a hardware watchdog is adopted, so that the program of the main control chip can be prevented from going wrong; the MCU chip of the hardware watchdog can control an LED load when the main control chip fails; the memory stores various scene modules which can be conveniently selected by auser; and PWN signals are adopted to control the driving circuit, and therefore, the current of the LED load is stable.