The utility model provides a baby stroller capable of be folded with one hand, which comprises a comprise a joint seat, an upper joint, a lower joint, an annular pressing block, a lock device being used in the lower joint and the upper joint to avoid rotating among the lower joint, a folding device being used to control the lock device for locking or releasing the upper joint and the lower joint, wherein the folding device comprises a connecting seat, a lever, a wire and a lifting belt; the connecting seat is provided with first release components to control and lock the lever in case of movement. The present invention can fold the baby stroller by one hand, and the operation is very convenient, flexible, and effortless.