A laundry treatment agent dispensing assembly for use in a laundry treatment device, and a laundry treatment device including a body; the laundry treatment agent dispensing assembly includes a storage container fixed to the body, a dispensing container slidably connected to the body, and a liquid guiding cannula; one end of the liquid guiding cannula is communicated with the dispensing container, and the other end of the liquid guiding cannula is inserted into the storage container; the length of the liquid guiding cannula is set so that the other end of the liquid guiding cannula does not go out of the storage container when the dispensing container moves away from the storage container; when a laundry treatment agent is added, it is only needed to pull the dispensing container from the body, and the liquid guiding cannula enables the dispensing container to be communicated with the storage container.