The invention discloses numerical control machining technological equipment for outer-grid wall plates. The equipment comprises pressing plates (3), tension devices (2), tightly-pressing devices (5) and an arc blank (4) with a vacuum sucking disc. The arc blank (4) with the vacuum sucking disc is matched with a shell wall plate in radian. After being bent according to the radian of the shell wall plate, a to-be-machined flat plate is placed on the arc blank (4). The two ends, in the direction of the generatrix of the arc blank (4), of the bent to-be-machined flat plate are tightly pressed through the pressing plates (3), and the other two ends are tensioned in the tangential direction of the outer end of the bent to-be-machined flat plate through the tension devices (2); and after out-grid milling is completed, allowances, in the arc direction, of the two ends of the bent flat plate are cut off, and instead, the two ends of the bent flat plate are subjected to normal pressing through the tightly-pressing devices (5).