The utility model relates to a replaceable breathing training device, which comprises a T-shaped tube, a container, a snake tube and a modeling set.The T-tube has a first channel and a second channel connected with each other； the container is connected with the first channel of the T-tube； the snake tube is connected with the second channel of the T-tube； the modeling sleeve is a hollow cover body with at least one first through-hole, so that the modeling sleeve can be covered on the outside of the T-tube and the container, and the second through-hole, so that the snake tube can be connected with the first channel of the T-tube through the second through-hole The channel is protruded on the outside of the molding sleeve.Through the design of the T-tube and the container, we can change the different shape of the T-tube and the container according to the children's preference.一種可更換造型之呼吸訓練器，包括一T型管、一容器、一蛇管以及一造型套。T型管具有相互連通得第一通道以及第二通道；容器係連接於T型管的第一通道上；蛇管則連接於T型管的第二通道；造型套為一中空罩體，具有至少一第一通孔，使造型套得以罩設於T型管及容器之外部，以及一第二通孔，使蛇管得以通過第二通孔連接在T型管的第一通道上，並凸露於造型套的外部。藉此，透過罩設在T型管及容器外部之造型套的造型設計，以隨兒童患者之喜好，更換不同造型的造型套。
