The invention discloses a dynamic property experimental device of a pull rod rotor of a heavy-duty gas turbine, which comprises two bearing blocks that are arranged oppositely on the left and the right on the basis of an experimental platform, a pull rod rotor used for experiment is arranged between the bearing blocks, and a direct current motor is arranged outside the left bearing block, electrically connected with an electric control cabinet and connected with one end of the pull rod motor that extends out of the left bearing block through a first sleeve pipe; an electric generator is arranged outside the right bearing block and connected with the other end of the pull rod motor that extends out of the right bearing block through a second sleeve pipe; an electric eddy current displacement sensor is respectively arranged on shaft necks at the two ends of a rotating shaft of the pull rod motor that are corresponding to the left and the right bearing blocks, and the electric eddy current displacement sensor is connected with a dynamic signal collector that is connected with a computer; a speed measuring gear is respectively arranged at the shaft rear of the electric generator and the first and the second sleeve pipes, a pair of rotating speed sensors are symmetrically arranged along the diameter direction of the gears and connected with a torsional vibrometer, and the torsionalvibrometer is connected with the dynamic signal collector by a signal.