The invention discloses a LED (Light Emitting Diode) flexible light strip in various sizes and different colors. The LED flexible light strip comprises a casing, a first mounting bracket, a first connecting seat, a connecting column, a first FPC flexible plate, a first LED wick, a second connecting seat, a fixed shaft, a second mounting bracket, a first clamping plate, a second clamping plate connecting groove, guide rails, a sliding sleeve, a first helical tooth socket, a connecting bump, a second helical tooth socket, a second FPC flexible plate, a second LED wick, double-sided glue and a folded slot; the first FPC flexible plate is embedded into the inner part of the casing; the top of the first FPC flexible plate is welded with the first LED wick; the second FPC flexible plate is connected to one end of the first FPC flexible plate; in addition, the folded slot is formed in the joint of the first FPC flexible plate and the second FPC flexible plate; the top of the second FPC flexible plate is welded with the second LED wick; the bottom of the first FPC flexible plate and the second FPC flexible plate are both glued by the double-sided glue. The LED flexible light strip disclosed by the invention has the characteristics of easiness in installation and capability of adjusting an illuminating angle and emitting a variety of different color light.