Adjustable pulley block mechanism

The utility model discloses an adjustable pulley block mechanism and relates to a pulley block mechanism. The adjustable pulley block mechanism is used for solving the problems that an manner of increasing bob-weight manner is used or a rope reeling method for changing pulley clocks is used for achieving working stability of a pulley block, the problem that weight of fixing and supporting pulley block parts is increased, and the weight quality is required to be relatively fixed exists in the increasing bob-weight manner, and the problem that rope reeling process is complex, machining is difficult, requirements for steel wire ropes are high exists in the rope reeling method for changing the pulley blocks. N movable pulley single bodies are lifted through a lifting beam device. A movable pulley block is arranged on the upper portion of a fixed pulley block. The fixed pulley block is fixedly connected with the ground. Two ends of a steel wire rope are fixedly connected with a first fixed pulley block and the wei