Indoor lighting system for building

The invention discloses a building indoor lighting system which comprises a light guide pipe and a light collecting cover installed at the top end of the light guide pipe, the bottom end of the light guide pipe is connected with a light diffuser, a transverse plate is further installed at the top end of the light guide pipe, the light guide pipe is located in a wall plate, and the building indoor lighting system further comprises a cleaning mechanism. The cleaning mechanism is installed on the upper end face of the transverse plate and used for cleaning dust on the outer end face of the light collecting cover. The air exchange mechanism is arranged on the side of the light guide pipe and used for exchanging indoor air and outdoor air. According to the indoor lighting system for the building, the corresponding cleaning mechanism is arranged, airflow is generated through rotation of the cleaning mechanism to conduct nondestructive cleaning on the surface of the light collecting cover, the device can have the ai