Delay dimming power saver for LED lamp

The invention discloses a delay dimming power saver for an LED lamp, and solves the problem of power consumption of 24-hour illumination of lamps in underground parking lots and aisles. The device comprises an induction time-delay module and an AC step-down switching module, the AC step-down switching module is connected with an AC mains supply through a power switch, and 220V alternating current is respectively reduced to three switchable gears, for example, the first gear is smaller than or equal to 1W, the second gear is smaller than or equal to 3.5 W, and the third gear is smaller than or equal to 5.5 W to output electric quantity. The power of an LED lamp tube with the rated power of 16W can be reduced to be smaller than or equal to 3.5 W by selecting a gear (2), the induction time delay module and the AC voltage reduction switching module are connected with alternating current mains supply through the same switch, 220V voltage is output to the LED lamp tube with the induction time delay module as the ce