The invention discloses a light collection device, which comprises a control device, a rotation device and a lighting device, wherein the control device is connected with driving mechanisms of the rotation device and the lighting device and drives the lighting device to form a certain angle with incident sunshine; the rotation device tracks the incident sunshine in the horizontal direction; the lighting device comprises a longitudinal tracking device and a rotatable optical device; and the optical device is driven by the longitudinal tracking device to form the certain angle with the incident sunshine. The light collection device changes the direction of the incident sunshine into a certain given direction. By the device, independent of a medium, light can be always conducted inside a building according to a certain direction.