The plastic foldable stool is composed of the stool surface and the stool legs. The connection between the stool surface and the stool legs is hinged. The lower part of the stool surface is concave, the lower part of the two stool legs is M-shaped or similar to M-shaped, and the concave part of the two stool legs and the middle part of the bottom surface of the stool surface are hinged by two connecting rods. The utility model has the advantages that the stool legs can be folded into the stool surface and viewed from the outside, which is only a stool surface and is very convenient to carry. In addition, the utility model has the advantages of reasonable structure, good mechanical properties and low price.