Pick-up arm structure for library book taking robot

The picking arm structure for the library book taking robot comprises an arm rod assembly, the end portion of the arm rod assembly is fixedly connected with one end of a rotating assembly, the other end of the rotating assembly is fixedly connected with a clamping hand assembly, the arm rod assembly comprises a telescopic main rod, and one end of the telescopic main rod is slidably connected with a telescopic auxiliary rod in a sleeved mode. A motor is fixedly connected to the end, away from the telescopic slave rod, in the telescopic master rod, a first lead screw is fixedly connected to a rotating shaft of the motor, a first threaded sleeve fixedly sleeves the end, close to the telescopic master rod, of the telescopic slave rod, and the first lead screw is in meshed connection with the first threaded sleeve. The clamping hand assembly is provided with the sliding supporting bottom plate and the fixed supporting bottom plate, when a plurality of vertical books are clamped, the sliding supporting bottom plate