The invention discloses a signal-amplification corridor energy-saving illumination system which is characterized in that the system is mainly composed of a central controller; a power supply, an illumination driving circuit and a fidelity two-stage amplification circuit which are respectively connected with the central controller; a analog-to-digital conversion chip connected with the fidelity two-stage amplification circuit; an infrared sensor and a light sensitive sensor which are respectively connected with the analog-to-digital conversion chip; and an illumination lamp connected with the illumination driving circuit. According to the invention, the fidelity two-stage amplification circuit is arranged, signals output by the infrared sensor and the light sensitive sensor are very weak, and the fidelity two-stage amplification circuit can amplify the signals without distortion, so that the sensitivity of the signal-amplification corridor energy-saving illumination system is improved.