This paper describes two schemes of lengthening steel structure hole processing machine tool. Their base length of lengthening steel structure hole processing machine tool is fixed and the column who can move around realizes the horizontal movement by dovetail slot and the screw. The former can realize that a machine can simultaneously process multiple holes after work-piece being clamped once. The latter is that machine tool can only process a single hole for the work-piece clamping, then process other holes by the mobile of the column and the spindle box. It is not only labor-saving and energy but is efficiency. Through the NC programming, the machine tool can fast install the parts and process four holes at the same time accurately. In allusion to all sorts of questions of the present NC programming using G, M code, lengthening steel structure hole processing machine tool based on open CNC is proposed in the paper, which can machining parts directly by using the corresponding computer modules and achieves information sharing of work-piece.