The structure of an animal's toilet bag is a bag body, which forms a fold shape and can expand and contract along its length direction； an end face is arranged at the opening of the bag body, and a fold line is divided into two pairs of junction surfaces, wherein the two pairs of junction surfaces are respectively provided with junction parts, and after the end face of the opening is bent along the fold line, the junction parts on the opposite junction surface are mutually stuck, so as to close the opening.一種動物之便袋結構為一袋體，其形成皺褶狀且可沿其長度方向伸縮；此袋體之開口處設有一端面，且以一折線區分為二對合面，其中此二對合面上分別設有結合部，而可於開口之端面沿折線彎折後與相對之對合面上之結合部相互卡合，俾以封閉開口。
