The present invention provides a power supply for LED lights with timing power reduction, which includes fuse F1, rectifier transformer L1, capacitor CX1, filter U, rectifier transformer L3, sliding resistor VR2, diode D, resistor R4, filter capacitor C3, and voltage regulator diode WZ , PWM regulator U1M and resistor R6, the right end of fuse F1 is connected to rectifier transformer L1, the right end of rectifier transformer L1 is connected to capacitor CX1, the right end of capacitor CX1 is installed with filter U, the right end of filter U is connected to rectifier transformer L3, and the right end of rectifier transformer L3 is connected to sliding resistor VR2, this design realizes the protection of the main body of the power supply, the right end of the diode D is respectively connected to the resistor R4 and the filter capacitor C3, the right end of the resistor R4 is respectively connected to the Zener diode WZ and the PWM regulator U1M, and the right end of the PWM regulator U1M is connected to the resistor R6. The output power of the LED lamp L5 can be adjusted, it is easy to operate, it can protect the circuit, it can be intelligently adjusted, it is easy to disassemble, it has good stability and high reliability.