A natural light guiding system used for plant cultivation includes a chasing light and collecting light device and at least one lighting device connected to the chasing light and collecting light device. The at least one lighting device includes a lampshade is hollow and cone-shaped. A top plate is mounted to a top of the lampshade. At least one optical fiber is connected to the chasing light and collecting light device. At least one collecting lens barrel is disposed on the top of the lampshade and projects light into the lampshade. A free ends of the at least one optical fiber is connected to the at least one collecting lens barrel. At least one LED light source is mounted onto an inner periphery of the lampshade and provides an auxiliary lighting effect when a natural light source is not enough.
