Abstract: A dial segmented dimming circuit, comprising an AC input terminal, an EMI module, a rectifying module, an input filter module, a transformer, an output filter module and a DC output terminal, and a PWM main control module; the DC output terminal is connected to a LED lamp array module; the AC input terminal is connected to a wall switch, the dial segmented dimming circuit includes a dial segmented dimming module, a rotary switch dimming module and a regulated power supply module; the rotary switch dimming module is connected to the PWM main control module via a photoelectric coupling feedback module; the dial segmented dimming module includes a dial switch control chip and a light intensity dial switch and a power dial switch; the light intensity dial switch and power dial switch are interconnected.