The utility model relates to a first-level blade of a gas compressor used for a high-power gas turbine, which belongs to a first-level blade of a gas compressor, and aims at solving the problems that the efficiency of a middle-level blade of the gas compressor used for the high-power gas turbine is low, the service life is short, and the operation safety of the gas compressor is affected. The working part and the root of the blade are integrated from top to bottom, the molded line of the working part of the blade is a variable cross-section twisted blade, the shapes of cross sections of the working part are different along the height of the blade, the sectional area of the working part is gradually reduced from the root part to the top part, relative torsion exists between two adjacent cross sections, and the geometrical data of cross sections of the working part of the blade from the root part to the top part are as below: the height H from a cross section B-B to a cross section W-W is 0 to 537.845 mm, the axial width is 198.016mm to 121.044 mm, the chord length is 210.057mm to 274.214 mm, and the bending angle is 20.025 degrees to 65.096 degrees. The first-level blade is used on the gas compressor used for the high power gas turbine.