The utility model relates to a control device for quick mounting of telescopic arms of a slide guide plate of a coiler. The control device comprises four independent bases. Flat plates are horizontally fixed on the bases, two flat plates on the same side with the side guide plate are welded fixedly and integrally through a plurality of steel profiles, a set of iron angles for insertion of a telescopic arm box is perpendicularly fixed on the upper surface of each flat plate, and accordingly after mounted in position, the telescopic arms on the same side with the side guide plate have mutually parallel center lines perpendicular to a rolling center line. The control device comprises the four bases, design precision of mounting is controlled according to steel structure plane reference, geometric accuracies (horizontality, perpendicularity, linearity, parallelism and diagonal lines) as well as displacement positioning of the bases for the telescopic arm boxes are controlled through the iron angles, a set of relatively stable geometric dimensional accuracy chains is formed, synchronizing shafts are combined and connected, the mounted telescopic arms are high in accuracy, fine in stability and high in impact resistance, great convenience is brought for maintenance or replacement, and support is provided for standard maintenance.