A sunlight lighting system used in a greenhouse or plant factory. By means of a combination of a controller, a condenser lens, a main driving mechanism, and an illuminator (31), sunlight is converted into light having a stable illumination direction and controllable light intensity, suitable for the lighting requirements of high-density stereoscopic cultivation frames (81). A supporting greenhouse (92) is further comprised, a facade or top is provided with a light through hole (99), and a main optical axis of the sunlight lighting system passes through the light through hole (99). A supporting lighting method is further comprised, and therefore, a good lighting effect is obtained with few steps.
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