The invention discloses a finished product packaging device for the production of polyaluminum chloride and a working method thereof, comprising a base plate 1 and a base plate 2, a splint 1 is fixedly installed on the upper end of the base plate 1 close to the rear end, and the upper end of the splint 1 is positioned close to both sides. A movable groove is provided, and a movable block is inserted inside the movable groove, the upper end of the movable block is provided with a second splint, the upper end of the first splint is provided with several groups of grooves, and the lower end of the second splint is provided with several groups of protrusions, A horizontal plate is fixedly installed near the edges of both sides of the bottom plate, and a long groove is opened at the right end of the horizontal plate, and a baffle plate is inserted inside the long groove, and the left side of the horizontal plate near both ends runs through There is a slot hole, and a screw is inserted inside the slot hole; the present invention can limit the position of the packaging bag filled with finished products, prevent the packaging bag from moving during the sealing process, and thus seal the packaging bag well and facilitate the work Personnel transport the packaged finished product.