The invention discloses a telescopic mechanical hand which comprises a sliding track, an electric hoist, a rotating rod, an annular groove, a steel wire, a supporting top plate, a first guiding telescopic rod, a second guiding telescopic rod, a first supporting square rod, a second supporting square rod, a first driver, a second driver, a motor and a rotating plate, wherein a mechanical hand support is mounted at the lower end of the rotating plate, an arc-shaped bracket is mounted outside the mechanical hand support, a middle supporting rod and a bottom supporting part are installed in the arc-shaped bracket, a plurality of hinged seats are mounted at the lower end of the bottom supporting part, and one mechanical clamping jaw is mounted on each hinged seat. By utilizing the sliding track, the horizontal position adjustment of the whole telescopic mechanical hand is achieved; by arrangement of the first driver and the second driver, the whole telescopic mechanical hand can rise and fall; by arrangement of the motor, the rotary motion of the telescopic mechanical hand can be implemented, and a workpiece is captured conveniently by utilizing the mechanical clamping jaw.