An environment-friendly golf ball includes a core body, a bonding material, and a cover for enclosing the core body. The core body is made of a dissoluble material, which is mixed with the bonding material at a predetermined ratio, so as to make the dissoluble material become an aggregation of specific shape. The shaped structure is steamed and solidified, so as to eliminate the water in the structure. The cover is molded from a dissoluble molding and covering material. The whole structure is water dissoluble and becomes the food of marine life and would not cause pollution to environmental ecology when the golf ball falls into water and could not be collected.