The utility model is a portable connecting body foldable stool, which belongs to the daily furniture, and is characterized in that: a connecting active tenon arranged on the left and right stool face and the left and right supports is provided, a coupling connected active tenon is arranged between the left stool face and right stool face, and a coupling connected active tenon is arranged between the left stool face and the right support. The left and right stool faces are both three step boards respectively with two steps. Each slope step is provided with an active tenon formed by at least two closed strip-shaped tenon holes separated by ribs. Due to the special coupling connected active tenon structure, the stool face and support are connected together skillfully, enabling the foldable stool a long service life. The foldable stool can also be put into the attached box after being folded, which is easier to take and keep. The utility model is in creative and reasonable structure and of application value.