The straightening machine is applicable to assemble and spot- wclddifferent kinds of H type steel such as symmetry, dissymme- try, dissymmetry, eccentricity and variable cross-section. The machine use one-side manual/electricadjuting with linking rod and aother side pressing tightly with hydraulic pressure wich is very popular in the world. It usee different speed of welding and empty moving and improves dffdotively wording efficiency