Abstract: A decorative aqua ball mainly comprises a base, a power device disposed in a cavity of the base, a music box connected with the power device, a transparent casing sitting on the base, an ornamental article placed in the transparent casing, and a lid plug hermetically sealed on an opening of the casing. The aqua ball further comprises a rotation device which is composed of an upper turntable and a lower turntable situated on the lid plug on respective top and bottom faces in virtue of mutual attraction of respective pieces of enhanced magnets residing face to face on the turntables. By proper arrangement of the magnets, both turntables can rotate synchronously without needing extra power so that a reliable aqua ball is realized to present dynamic sightly scene for appreciation.