The utility model relates to a water change toilet, which comprises a suction pipe, a valve and a guide line, wherein the valve is respectively connected with a suction pipe equipped with a filter screen and a guide line filled with water； the invention mainly uses a control valve to trigger or block the siphon phenomenon caused by the guide line filled with water, and in the process of use, the siphon phenomenon will not be disturbed by improper operation The sediment at the bottom of the aquarium and the suction pipe equipped with a filter screen will not absorb the fish, shrimp, sand and stone in the aquarium.一種換水吸便器，係包含有吸入管、閥門以及導引管線，其中該閥門分別連結設有過濾網之吸入管以及內部充滿水之導引管線；本創作主要係透過控制閥門來觸發或是阻斷內部充滿水之導引管線所引起的虹吸現象，在使用的過程中不會受到人為操作不當而攪動到水族箱底部之沉積物，設有過濾網之吸入管也不會將水族箱內的魚、蝦、沙粒、石頭吸除。
