The invention discloses an LED (Light Emitting Diode) driving circuit, which comprises a direct-current (DC) input power supply and at least one branch. The branch is connected between the positive terminal and the negative terminal of the DC input power supply and comprises a plurality of LED groups, bypass circuits and a constant-current source circuit, wherein each LED group is formed by connecting at least one LED in series, the bypass circuits correspond to the LED groups, input terminals of the bypass circuits are connected with positive poles of the LED groups, output terminals of the bypass circuits are connected with negative poles of the LED groups, a single LED group and a single bypass circuit corresponding to the single LED group form a unit link, a unit link group is formed after a plurality of unit links are connected in series, the unit link group is connected between the positive terminal of the DC input power supply and the input terminal of the constant-current source circuit in a series, the output terminal of the constant-current source circuit is connected with the negative terminal of the DC input power supply, and a control terminal of the bypass circuits is connected with a driving terminal of the constant-current source circuit. The LED driving circuit has the advantages of little linear loss, very high reliability, very simple circuit structure, small size, and capability of being formed through partial or all integration.