A laundry treatment agent storage and dispensing device for a washing machine, comprising a storage device and a dispensing device being integrally arranged, wherein the storage device is internally provided with a storage cavity, and the storage cavity is configured to be storing laundry treatment agent, the dispensing device is provided with a hollow cavity, and a flexible separator is hermetically installed in the hollow cavity to divide the hollow cavity into a water inlet cavity and a liquid storage cavity, the liquid storage cavity is provided with a liquid inlet end and a liquid outlet end (103, 107); the liquid inlet end is communicated with the storage cavity; and the liquid inlet end and the liquid outlet end (103, 107) are respectively provided with a one-way communicating device, the flexible separator is deformable towards the liquid storage cavity by inlet water of the washing machine so that the one-way communicating device in the liquid outlet end (103, 107) is opened to dispense laundry treatment agent through the liquid outlet end (103,107), and the flexible separator is restorable from deformation when the washing machine stops feeding water so that the one-way communicating device in the liquid inlet end is opened to suck the laundry treatment agent in the storage cavity into the liquid storage cavity, characterized in that, the storage device comprises a storage housing internally provided with the storage cavity, a filling port, communicated with the storage cavity, being provided on the storage housing, and the dispensing device is integrally arranged on the storage housing; wherein the dispensing device comprises a housing internally provided with the hollow cavity, the housing comprises a first housing and a second housing, at least one of the first housing and the second housing is internally provided with an open groove, and the first housing and the second housing are hermetically connected to seal the open groove to form the hollow cavity, an edge of the flexible separator is hermetically pressed between the first housing and the second housing to divide the hollow cavity into the water inlet cavity and the liquid storage cavity, a water inlet end (101, 105) and a pressure relief end (102, 106) which are communicated with the water inlet cavity are provided on the first housing, and the liquid inlet end and the liquid outlet end (103, 107) which are communicated with the liquid storage cavity are provided on the second housing, and the second housing and the storage housing are integrally arranged. the storage device is internally provided with a storage cavity, and the storage cavity is configured to be storing laundry treatment agent, the dispensing device is provided with a hollow cavity, and a flexible separator is hermetically installed in the hollow cavity to divide the hollow cavity into a water inlet cavity and a liquid storage cavity, the liquid storage cavity is provided with a liquid inlet end and a liquid outlet end (103, 107); the liquid inlet end is communicated with the storage cavity; and the liquid inlet end and the liquid outlet end (103, 107) are respectively provided with a one-way communicating device, the flexible separator is deformable towards the liquid storage cavity by inlet water of the washing machine so that the one-way communicating device in the liquid outlet end (103, 107) is opened to dispense laundry treatment agent through the liquid outlet end (103,107), and the flexible separator is restorable from deformation when the washing machine stops feeding water so that the one-way communicating device in the liquid inlet end is opened to suck the laundry treatment agent in the storage cavity into the liquid storage cavity, characterized in that, the storage device comprises a storage housing internally provided with the storage cavity, a filling port, communicated with the storage cavity, being provided on the storage housing, and the dispensing device is integrally arranged on the storage housing; wherein the dispensing device comprises a housing internally provided with the hollow cavity, the housing comprises a first housing and a second housing, at least one of the first housing and the second housing is internally provided with an open groove, and the first housing and the second housing are hermetically connected to seal the open groove to form the hollow cavity, an edge of the flexible separator is hermetically pressed between the first housing and the second housing to divide the hollow cavity into the water inlet cavity and the liquid storage cavity, a water inlet end (101, 105) and a pressure relief end (102, 106) which are communicated with the water inlet cavity are provided on the first housing, and the liquid inlet end and the liquid outlet end (103, 107) which are communicated with the liquid storage cavity are provided on the second housing, and the second housing and the storage housing are integrally arranged.