A baby carriage, comprising a foldable frame, a front wheel assembly, a rear wheel assembly (3, 4), a locking mechanism for locking the frame when it is unfolded, and a supporting device disposed on the frame for supporting a baby, wherein the frame comprises: a front bracket, to which the front wheel assembly is mounted, the front bracket having a rear portion; a push rod, which has a lower portion being rotatably connected with the rear portion of the front bracket in such a way that the push rod can rotate relative to the front bracket around a first axis of rotation; an upper connecting bracket disposed above the front bracket, the upper connecting bracket having a rear portion being rotatably connected with the push rod in such a way that the upper connecting bracket can rotate relative to the push rod around a second axis of rotation, and a front portion; a rear bracket, to which the rear wheel assembly (3, 4) is mounted, the rear bracket comprising a first rod and a second rod which are connected with each other; a rotation joint, which is pivotally connected to the first rod or the second rod, the rotation joint being rotatably connected with the front portion of the upper connecting bracket such that the upper connecting bracket can rotate relative to the rotation joint around a fourth axis of rotation; wherein each of the first axis of rotation, the second axis of rotation, the third axis of rotation and the fourth axis of rotation extends transversely; characterised in further comprising a sliding part, which is rotatably connected with the front bracket in such a way that the sliding part can rotate relative to the front bracket around a third axis of rotation; wherein the first and second rods can rotate relative to each other around a fifth axis of rotation, the fifth axis of rotation being above the sliding part when the frame is unfolded, the first rod and the second rod respectively being slidably connected with two sides of the sliding part. a front bracket, to which the front wheel assembly is mounted, the front bracket having a rear portion; a push rod, which has a lower portion being rotatably connected with the rear portion of the front bracket in such a way that the push rod can rotate relative to the front bracket around a first axis of rotation; an upper connecting bracket disposed above the front bracket, the upper connecting bracket having a rear portion being rotatably connected with the push rod in such a way that the upper connecting bracket can rotate relative to the push rod around a second axis of rotation, and a front portion; a rear bracket, to which the rear wheel assembly (3, 4) is mounted, the rear bracket comprising a first rod and a second rod which are connected with each other; a rotation joint, which is pivotally connected to the first rod or the second rod, the rotation joint being rotatably connected with the front portion of the upper connecting bracket such that the upper connecting bracket can rotate relative to the rotation joint around a fourth axis of rotation; wherein each of the first axis of rotation, the second axis of rotation, the third axis of rotation and the fourth axis of rotation extends transversely; characterised in further comprising a sliding part, which is rotatably connected with the front bracket in such a way that the sliding part can rotate relative to the front bracket around a third axis of rotation; wherein the first and second rods can rotate relative to each other around a fifth axis of rotation, the fifth axis of rotation being above the sliding part when the frame is unfolded, the first rod and the second rod respectively being slidably connected with two sides of the sliding part.