Abstract: The disclosure relates to a light-curing 3D printer. The light-curing 3D printer includes a plurality of light-emitting sources which are uniformly arranged and simultaneously emit scattered lights; a grid plate which is located above the light-emitting sources, and has a vertical optical channel corresponding to a position right above one of the light-emitting sources which are located in the center of the optical channel which is surrounded by vertical and opaque side walls limiting the reflection of light; a lens which is located above a light-guiding member, and has a condensing lens unit formed corresponding to a position right above one of the optical channels; a liquid crystal display (LCD) transmitting screen which is located above the lens and has pixel lattices.