The invention discloses an LED dimming constant-current drive circuit. The LED dimming constant-current drive circuit comprises an input end, a rectification filter circuit, a power factor correction circuit, a dimming circuit, a constant-current circuit and an output end, which are sequentially connected with one another, wherein the input end is connected with a power supply; and the output end is connected with an LED. The LED dimming constant-current drive circuit disclosed by the invention not only has the characteristics of the universality and the reliability of an LED lamp and a dimmer, but also has the characteristics of simplicity in circuit, low cost, high PF value, high conversion efficiency, low radiation and the like, so as to obtain extremely high market competitiveness. In addition, operation of LED loads with different power can be achieved by only changing parameters of a resistor RT1, a resistor R5, a resistor R7 and an inductor L2 in the circuit and the power of related elements, so that the LED lamp manufactured by the LED dimming constant-current drive circuit has a good dimming effect no matter that the LED lamp is applied to a traditional dimmer or an existing or future dimmer; a high PF value can also be obtained; and the targets of high conversion efficiency, low radiation and low cost are achieved.