The invention discloses a lockhole illumination system based on human body induction. The system comprises a lock body, an illumination module, a brightness sensor, a human body sensor, a control module, a relay and a power supply module; the illumination module includes an annular tube surrounding a lockhole, and is connected electrically with the control module via the relay; and the controlleris connected electrically with the brightness sensor, the human body and the power supply module. During work, the control module switches on the relay and enables illumination when the brightness sensed by the brightness sensor is lower than or equivalent to a preset brightness threshold and the distance sensed by the human body sensor is lower than or equivalent to a preset distance threshold. The system is simple in structure and convenient to use, can be switched ON/OFF adaptively, and enables a user to insert a key conveniently.