A clothing treatment agent dispensing assembly for use in a clothing treatment device, the clothing treatment device comprising a body, wherein the clothing treatment agent dispensing assembly comprises: a dispensing container and a storage container that are sealingly connected to each other, wherein both the dispensing container and the storage container are capable of sliding relative to the body, so that the storage container can slide with the dispensing container in the body when the dispensing container is being pulled out of the body, and a dispensing mechanism fixedly connected to or integrally formed with the body, wherein the dispensing container and the storage container are slidingly connected with the dispensing mechanism, and wherein the dispensing mechanism comprises a containing cavity, the storage container is at least partially embedded in the containing cavity, and a length of the storage container is less than a length of the containing cavity, characterized in that a vertical section of the dispensing container is smaller than a vertical section of the storage container, wherein both the vertical section of the dispensing container and the vertical section of the storage container are taken along a direction perpendicular to a pulling direction of the dispensing container and the storage container, and the dispensing container is provided with a first sliding portion, the storage container is provided with a second sliding portion, and the dispensing mechanism is provided with a plurality of rollers matching the first sliding portion and the second sliding portion, the dispensing container is slidingly connected with the dispensing mechanism through the first sliding portion and the plurality of rollers, and the storage container is slidingly connected with the dispensing mechanism through the second sliding portion and the plurality of rollers. a dispensing container and a storage container that are sealingly connected to each other, wherein both the dispensing container and the storage container are capable of sliding relative to the body, so that the storage container can slide with the dispensing container in the body when the dispensing container is being pulled out of the body, and a dispensing mechanism fixedly connected to or integrally formed with the body, wherein the dispensing container and the storage container are slidingly connected with the dispensing mechanism, and wherein the dispensing mechanism comprises a containing cavity, the storage container is at least partially embedded in the containing cavity, and a length of the storage container is less than a length of the containing cavity, characterized in that a vertical section of the dispensing container is smaller than a vertical section of the storage container, wherein both the vertical section of the dispensing container and the vertical section of the storage container are taken along a direction perpendicular to a pulling direction of the dispensing container and the storage container, and the dispensing container is provided with a first sliding portion, the storage container is provided with a second sliding portion, and the dispensing mechanism is provided with a plurality of rollers matching the first sliding portion and the second sliding portion, the dispensing container is slidingly connected with the dispensing mechanism through the first sliding portion and the plurality of rollers, and the storage container is slidingly connected with the dispensing mechanism through the second sliding portion and the plurality of rollers.