The invention discloses an indoor illumination energy-saving controller, and relates to an energy-saving controller for indoor illumination. The controller comprises a dual-technology detector (microwave-passive infrared dual-technology detector), a switching power supply, a control circuit board, and a contactor controlling the on/off of an illumination power supply, wherein the control circuit board is provided with a delay circuit and an on/off circuit of the illumination power supply; the dual-technology detector, the contactor controlling the on/off of the illumination power supply, and the switching power supply are all connected to the delay circuit. The indoor illumination energy-saving controller can be used for controlling the indoor illumination power supply to be on when people exist indoors or to be delayed to be off when no people exists indoors, so that electric energy can be greatly saved.