A pet stair convenient to fold and store, comprising at least two stair cases. The rear side of a lower stair case (20) is connected to the front side of a higher stair case (10)； each stair case comprises a box body (11) having an opening at the top end, a pad (12) disposed at the bottom of the box body (11), and a pedal cover (13) disposed at the opening of the box body (11). The bottom of the box body (11) is made of soft foldable material. Each box body (11) comprises at least a front support wall (111) and two parallel opposite side support walls (112). The box body (11) of the highest stair case further comprises a rear support wall (113). Each side support wall (112) comprises at least two foldable plates (1121). Every two foldable plates (1121) are vertically connected to each other by means of soft material or a rotating connector. The foldable plates (1121) on each side support wall (112) can rotate to be folded up. When the foldable plates on the two opposite side support walls (112) are folded, the front support wall (111) of the corresponding box body (11) is pulled to move backwards and to approach. After the pet stair is folded and stored, the space occupied by the pet stair is greatly reduced, so that the pet stair is convenient to package and transport, and is simple and quick to mount.La présente invention concerne un escalier pour animal de compagnie pratique à plier et à ranger, comprenant au moins deux marches d'escalier. Le côté arrière d'une marche d'escalier inférieure (20) est relié au côté avant d'une marche d'escalier supérieure (10) ； chaque marche d'escalier comprend un corps de boîte (11) ayant une ouverture à l'extrémité supérieure, un coussinet (12) placé au fond du corps de boîte (11) et un couvercle de pédale (13) placé au niveau de l'ouverture du corps de boîte (11). Le fond du corps de boîte (11) est constitué d'un matériau pliable souple. Chaque corps de boîte (11) comprend au moins une paroi de support avant (111) et deux parois
