Abstract: A flexible circuit board is disclosed, including a first insulation layer, a second insulation layer and a circuit layer, wherein the first insulation layer is attached to one side of the circuit layer and the second insulation layer is attached to the other side of the circuit layer, each of the first insulation layer and the second insulation layer is provided with a foldable portion along their length, the foldable portion of the first insulation layer is corresponding in position with the foldable portion of the second insulation layer, and the circuit layer includes a set of power wires and at least one lighting wire. And a method for manufacturing the flexible circuit board, and a LED flexible strip light are also disclosed.