The invention relates to a foldable ladder chair which comprises a chair body with four corners provided with supporting feet respectively. The two sides of the chair body are provided with armrests respectively, and the two sides of the rear end of the chair body are further provided with leaning rods connected with the armrests respectively; the upper ends of the two leaning rods are connected through a blocking rod, and the lower end of each leaning rod is provided with a rear support hinged to the corresponding leaning rod; the other end of each rear support is provided with a front support hinged to the corresponding front support, and a horizontal supporting rod is further arranged at the position, close to the middle portion, between the two rear support; a pedal hinged to the front supports is arranged between the two front supports; the two ends of the supporting rod are further provided with connection rods hinged to the middle of the pedal respectively so that the other end of the pedal can be placed on the supporting rod and horizontally arranged. The foldable ladder chair can be used as a chair as well as a ladder and is simple in structure and convenient to transform.