The invention discloses an insulation ladder torsion test device and a using method thereof. A first bearing is mounted at the position, a first supporting plate is penetrated through, of the upper middle part of the first supporting plate, a first rotary shaft rotates cooperatively with the first bearing, a first polygon hollow cylinder is connected with one end of the first rotary shaft, a powerdevice is connected with the other end of the first rotary shaft, and a control system is connected with the power device; a second bearing is mounted on a second supporting plate in a thickness mode, a second rotary shaft rotates cooperatively with the second bearing, a second polygon hollow cylinder is connected with one end of the second rotary shaft, a gear is connected with the other end ofthe second rotary shaft, a gear cover is arranged above the gear, the gear cover is fixed to the second supporting plate, through holes are symmetrically formed in the gear cover which circumferentially corresponds to the gear, and each through hole is provided with grooves side by side. Each through hole is communicated with one end of either same side of the corresponding groove and provided with third rotary shafts, and each third rotary shaft is rotatably sleeved with a catch pawl.