The invention discloses an LED driving circuit. The LED driving circuit is connected with an LED array, wherein the LED array is an N-dimensional square matrix, and the N is a natural number which is larger than one. The LED driving circuit comprises a current source module, a bleeder circuit module, a comparator circuit module, a logic control module and a switch module, wherein the current source module is used for providing a constant-current power source for the LED array, the bleeder circuit module is used for carrying out voltage division sampling on input voltage, and outputting a plurality of sets of sampled voltage, the comparator circuit module is used for comparing reference voltage with the sampled voltage, and outputting a plurality of sets of comparison signals correspondingly, the logic control module is used for carrying out logical operation on the basis of the comparison signals, and outputting a logic voltage sequence, and the switch module is used for having on-off control over the LED array according to the logic voltage sequence. According to the LED driving circuit, when a switching tube is connected, the switching tube works in a linear zone, power consumption of the switching tube is reduced, and conversion efficiency is improved; according to a simulation result, the power factor of the LED driving circuit can be more than 99%, and the conversion efficiency of the LED driving circuit is about 90%.