The present disclosure relates to the technical field of LED light control, and in particular to an LED constant-current driver circuit. According to the LED constant-current driver circuit of the present disclosure, by connecting driver modules together in series, when a voltage is input, the input voltage is distributed to each driver module. Thus, different ranges of voltages can be input, and the attenuation of the input voltage is reduced, increasing the reliability of the system. Moreover, the overall structure is simple, reducing the cost of the product.