Steel structure machining and correcting device

The invention discloses a steel structure machining correcting device, and relates to the technical field of steel structure machining. The device comprises a mounting frame, the mounting frame comprises two protection plates, a half-face gear transmission toothed plate and a push rod which slide repeatedly, then the push rod can drive two straightening rollers to move in grooves in the two sides of the I-shaped steel in a reciprocating mode through a concave plate, and the distance between the grooves in the two sides of the I-shaped steel is corrected; when a first rack slides through a push rod, a first gear drives two second racks to slide reversely, so that two outer pressing plates extrude the outer surface of the I-shaped steel, a fourth gear is rotated through gear transmission, two third racks can slide reversely, and two inner pressing plates in a groove in any side of the I-shaped steel move reversely; the inner pressing plate and the outer pressing plate extrude the edge steel plate of the I-shape