A lifter comprises a base and guiding frames. A cross beam is arranged on the upper portions of the guiding frames, hanging lugs are arranged on the cross beam and fixedly installed on an object such as a wall through a bolt, fixed pulleys are arranged under the cross beam, lifting ropes are wound around the fixed pulleys, one end of each lifting rope is connected with a lifting platform, the other ends of the lifting ropes are connected with a balancing weight, and the mass of the lifting platform and an operator thereof and the mass of the balancing weight can be preset according to the ratio of 1:1; a lifting switch is matched with balance weight locks, an operating rod is arranged on the base, at least one multi-purpose hole is formed in the lifting platform, and the operating rod penetrates through the multi-purpose holes to be matched with the multi-purpose holes; the lifting switch comprises a pivot disc. The technical purpose of designing a lifter based on combination of physical balance, operating disturbance, coordinated cooperation and safe control is achieved; a lifting function is achieved by replacing a supporting rod with the operating rod in a two-hand free operation mode, and it is guaranteed that use is more convenient, easier and more interesting.