The invention relates to an active tap water saving device. The active tap water saving device comprises a pedestal, a positioning ball lower cover, a positioning ball upper cover, an actuating rod, apositioning ball ring, a first elastic element and a plurality of positioning balls. The actuating rod, the positioning ball ring, the first elastic element and the positioning balls are arranged between the positioning ball upper cover and the positioning ball lower cover, and the positioning ball upper cover and the positioning lower cover are jointly arranged in the pedestal and provided witha plurality of water flowing holes. According to the active tap water saving device, the positioning balls are clamped to different positions so that opening and closing of through holes in the positioning ball upper cover can be controlled, the effect of controlling the water yield is achieved, meanwhile, by means of the first elastic element, the active tap water saving device can automaticallyadjust a tap into a small water amount state after the tap is closed, a user does not need to manually adjust the water amount, and therefore the purpose of active water saving can be really achieved.