With a special moth avoidance wavelength, this "Rotary Moth-Repellent Lamp" combines with a geared motor and a conductive slip ring to generate rotation characteristics. It is installed in a cluster lampshade and placed in an orchard to generate on-off and diffracted beams at night which effectively repels the fruit piercing moths that fly into the orchard at night to stab and suck the fruit when the fruit trees such as honey peaches are mature, and reduces the invasion damage. This physical control is applied to solve the dilemma where chemical agents cannot be used or the coverage range of traditional moth-avoiding lamps are insufficient during the fruit tree mature period.