The invention discloses a dimming control circuit provided with a fan and having a turn-off function. The dimming control circuit comprises a light-emitting diode (LED) constant-current source, a pulse width modulation (PWM) reverse circuit, a dimming circuit, a switching circuit, a fan speed regulating circuit, a PWM signal device and an LED lamp with the fan, wherein the constant-current source is connected with the fan speed regulating circuit, the dimming circuit and the switching circuit respectively, and then connected in series with the LED lamp with the fan; the fan speed regulating circuit, the dimming circuit and the switching circuit are connected with the PWM reverse circuit; and the other end of the PWM reverse circuit is connected with the external PWM signal device. The dimming control circuit is simple in structure; the number of components is very small; and the loss and cost are reduced. PWM signals can be reversed through the PWM reverse circuit, so that fan speed and brightness following, dimming and switching-on/off can be performed synchronously. The dimming circuit is stable in dimming linearity and accurate in dimming proportion. The circuit switching-on/off loss is small. PWM speed regulation is realized through the fan speed regulating circuit and a divider resistor.