Sling hoisting system and control method

The embodiment of the invention relates to the technical field of cranes, and discloses a sling hoisting system and a control method. In the implementing manner, the sling hoisting system comprises atrolley, N hoisting mechanisms, N hoisting ropes and N pulleys fixed to the trolley; each hoisting mechanism comprises a coiling block and a motor, wherein the motor is contained in an inner cavity ofthe coiling block and is coaxial to the coiling block; a sling is provided with M side edges, N is larger than one, and N is the integral multiple of M; the hoisting mechanisms correspond to the pulleys in a one-to-one manner, and the pulleys correspond to the hoisting ropes in a one-to-one manner; each side edge of the sling is at least provided with two hoisting ropes; one ends of the hoistingropes are fixed to the coiling blocks of the hoisting mechanisms, and the other ends of the hoisting ropes are fixed to the side edge center point of the sling through the pulleys; and when the motorsof the hoisting mechanisms