The invention provides a lifting tool. The lifting tool comprises an inner cylinder (11), an outer cylinder (12), a driving piece (13) and a clamping jaw (14), wherein the inner cylinder is sleeved with the outer cylinder, the driving piece enables the inner cylinder and the outer cylinder to move relatively in the direction parallel to the axis of the inner cylinder, and the clamping jaw is connected with the lower portion of the outer surface of the inner cylinder. When moving in place relative to the inner cylinder towards the direction close to the clamping jaw, the outer cylinder pushes the clamping jaw to swing inwards so as to grab an object (12). When the outer cylinder moves for resetting relative to the inner cylinder towards the direction away from the clamping jaw, the clamping jaw swings outwards through the self weight so as to release the object. The driving piece is used for pushing the outer cylinder and the inner cylinder to move relatively, and accordingly, the outer cylinder pushes the clamping jaw to rotate by a certain angle to hold the object, and can carry the object to the designated position. Furthermore, the lifting tool utilizes a self-locking mechanism and is safe and reliable in working process.