The utility model discloses an intermediate blade of a gas compressor with a hub diameter of [phi] 658. The utility model discloses a blade of a gas compressor, and specifically relates to the intermediate blade of the gas compressor with the hub diameter of [phi] 658. The utility model aims at solving the problems that the molded surface of the intermediate blade of a conventional gas compressor with the hub diameter of [phi] 658 is not smooth, the quality is not stable, the service life is short, and the safe running of the gas compressor is influenced. The intermediate blade consists of a blade working part and a blade root; the blade working part and the blade root are made into a whole from the top to the bottom; two adjacent cross sections have relative torsion; the geometric data of the cross sections of the blade working part from a root part to a top part are that the cross sections from a cross section number A-A positioned at the root part to a cross section number F-F have heights of 5.32-72.71 mm, axial widths of 38.386-37.061 mm, chord lengths of 42.430-42.431 mm, gas inlet angles of 42.580-32.586 degrees, mounting angles of 63.501-45.223 degrees, and maximum molded line thicknesses of 4.934-3.465 mm; and the total height of the blade working part is 73.43 cm. The intermediate blade is used on the gas compressor with the hub diameter of [phi] 658.