Adjustable voltage?stabilization power supply circuit and lamp

The utility model is applied to the lamp field and particularly relates to an adjustable voltage?stabilization power supply circuit and a lamp. The adjustable voltage?stabilization power supply circuit provided by the utility model adopts independent components; the anode and the cathode of a protection diode are respectively connected with the output pin and the input pin of a voltage?stabilization chip; when reverse high voltage happens at the output end of the adjustable voltage?stabilization power supply circuit, the reverse high voltage can be reduced directly through the protection diode, and thus the voltage?stabilization chip is protected; and when great change happens to the voltage of a slide?rheostat, a filter?capacitor can be adopted for carrying out filtering on harmonic?waves at two ends of the slide?rheostat, and then the voltage?stabilization chip is protected.