A blanking process of H-beams comprises following steps: first, making an H-beam cut scribing template; second, placing a web of an H-beam on a block with the web facing up; third, marking front and back cut grooves on the web of the H-beam; fourth, scribing in succession; fifth, self-checking; sixth, making a cut in one end of the H-beam; seventh, repeating step six, and making a cut in the other end of the H-beam; eighth, repeating step six, cutting vertical sides of two lateral flange plates of the H-beam, joints of the web and the flange plates, and the web to separate two H-beam finished products; ninth, moving an uncut H-beam on the block, and cutting a bottom groove; tenth, repeating step six, and cutting over-weld holes and weld grooves on two sides of each H-beam finished product until multiple H-beam finished products are cut out. The blanking process is simple and convenient to use, H-beam blanking operation difficulty and labor intensity are greatly decreased, and H-beam blanking quality is improved; moreover, construction time is saved, production cost is greatly decreased, and production efficiency is improved.