In order to enhance a human-environment interactive experience by an energy saving mode as much as possible, the invention provides a monitoring method for energy saving of a lighting unit of an intelligent home system. The monitoring method comprises the following steps of acquiring illumination information and angular variation information of environment light by an environmental light sensing unit, working reference information thereof and a timing unit; detecting distance information between a user and the lighting unit by a plurality of infrared distance measurement units; carrying out lighting angle adjustment and illumination adjustment on the lighting unit by a light control unit according to the detected environment light information and the distance information, and simultaneously monitoring energy consumption of a first light energy-saving control system; and acquiring working reference information of environment light sensing unit of other light energy-saving control systems in a preset range and energy consumption corresponding to the other light energy-saving control systems after a preset first time frame.