A lens-holding-and-aligning seat and an LED light panel thereof are presented. The light panel includes a substrate, an LED, a lens and a holding-and-aligning seat. The LED is disposed on the substrate in corresponding to a soldering pad of the substrate, and the holding-and-aligning seat has a holding portion and an aligning element. The lens is fixed on the holding-and-aligning seat by the holding portion, and the aligning element is bonded on the soldering pad corresponding to the soldering pad by a reflow process. Therefore, the lens is aligned with the LED by a soldering self-alignment mechanism, such that the light shape and light intensity distribution of the light emitted by the LED may be adjusted by the lens.