The invention discloses compaction technology and a compaction device for an iron core of an electric reactor. Firstly, a screw which is fixed on a lower yoke and passes through a coil and an upper yoThe invention discloses compaction technology and a compaction device for an iron core of an electric reactor. Firstly, a screw which is fixed on a lower yoke and passes through a coil and an upper yoten, the jacks, the lower platen and the pressure transfer device are orderly removed. The compaction technology and the compaction device flexibly combine the quantity of small jacks according to theten, the jacks, the lower platen and the pressure transfer device are orderly removed. The compaction technology and the compaction device flexibly combine the quantity of small jacks according to theneeded jack tonnage and the tonnage of the prior small jacks, and have the characteristics of simple structure, low processing cost, and convenient use. needed jack tonnage and the tonnage of the prior small jacks, and have the characteristics of simple structure, low processing cost, and convenient use.ke is firmly screwed by a nut; a pressure transfer device passes through the screw until the pressure transfer device contacts the upper yoke; a lower platen is arranged on the pressure transfer devicke is firmly screwed by a nut; a pressure transfer device passes through the screw until the pressure transfer device contacts the upper yoke; a lower platen is arranged on the pressure transfer device through the screw, and is at least provided with two guide posts, and the guide posts are symmetrically arranged relative to the screw or are evenly arranged along the periphery of the screw; each ge through the screw, and is at least provided with two guide posts, and the guide posts are symmetrically arranged relative to the screw or are evenly arranged along the periphery of the screw; each guide post is provided with a small tonnage hollow jack, and the jack is fastened by an upper platen through a transition nut; a hydraulic system of each jack is simultaneously supplied with oil, the juide post is provided with a small tonnage hollow jack, and the jack is fastened by an upper platen through a transition nut; a hydraulic system of each jack is simultaneously supplied with oil, the jack acts downward, and the nut is firmly screwed when a clearance appears between the nut and the upper yoke; and finally the whole compaction work is finished after the transition nuts, the upper plaack acts downward, and the nut is firmly screwed when a clearance appears between the nut and the upper yoke; and finally the whole compaction work is finished after the transition nuts, the upper pla