The utility model relates to an easy water changing structure of a fish tank, which is used for water exchange of a fish tank, and comprises a water changing body, and a water inlet component, an outlet pipe and a water pipe which are arranged on the water changing body. The outer shape of the water-changing body is exactly the same as the inner edge of the open end of the fish tank, and a rubber ring is disposed around the outer edge of the water-changing body, so that the water-exchange body is positioned at the inner edge of the open end of the fish tank by the rubber ring, and the water-changing body is appropriately disposed. a water inlet and a water outlet, the upper end of the water inlet is connected to one end of the water inlet element, the other end is extended downward, and the upper end of the water outlet is connected to one end of the water outlet pipe, and the other end is available for the water discharge pipe When the water changing body is positioned at the inner edge of the fish tank, the lower end of the water pumping pipe is located at the bottom of the fish tank, so that when the water inlet element supplies water to the fish tank, water at the bottom of the fish tank can flow out through the water pumping pipe. To achieve easy water change.一種魚缸之輕鬆換水結構，係用於魚缸的換水，其構成包括一換水本體，以及組設於該換水本體上之進水元件、出水管、抽水管。該換水本體的外形尺寸恰巧與該魚缸開放一端內緣相同，其外緣周圍套設有一膠環，令該換水本體利用該膠環定位於該魚缸開放一端內緣，又該換水本體適當處設一進水口及出水口，該進水口上端可供該進水元件一端組接，另端則向下貫穿延伸，而該出水口上端可供該出水管一端組接，另端可供該抽水管組接，當該換水本體定位於該魚缸內緣時，該抽水管下端係位於該魚缸底部，據以當該進水元件向該魚缸供水時，魚缸底部的水能經由該抽水管向外流出，達到輕鬆換水目的。
