Adjustable sliding block structure, telescopic mechanism and engineering machinery

The utility model provides an adjustable sliding block structure, a telescopic mechanism and engineering machinery, and relates to the technical field of engineering machinery, the adjustable sliding block structure is applied to a telescopic structure, the telescopic structure comprises a first section cylinder and a second section cylinder which are mutually sleeved, and the side wall of the first section cylinder is provided with a mounting hole; the adjustable sliding block structure comprises a mounting base, a movable base, an adjusting piece and a sliding block, the mounting base is used for being mounted at a mounting hole in the side wall of the first section cylinder, the mounting base is provided with a first threaded hole used for being communicated with the mounting hole, the movable base is in threaded connection with the first threaded hole, and the movable base is provided with a second threaded hole axially parallel to the first threaded hole; the adjusting piece is in threaded connection wit