The invention discloses a detaching apparatus applied to stator iron core repair. The detaching apparatus comprises a circular-ring-body-shaped shell, a bottom cover and a top cover, wherein a slot is formed in the outer wall on one side of the lower part of the shell; limiting lug bosses are formed on the inner wall of the shell on the two sides of the slot; horizontal guiding rails are inserted in the slot of the shell; one ends of the guiding rails are fixed on the inner wall of the shell while the other ends of the guiding rails are fixed on a stand column; a rotary plate is mounted on the guiding rails in the shell; notches are formed in the two sides of the rotary plate; a circular table is fixed in the center of the rotary plate; a spline groove is formed in the circular table; a positioning column is fixed on the rotary plate around the circular table; a supporting shaft is arranged above the circular table; a spline shaft is formed at the lower end of the supporting shaft; the upper end of the supporting shaft is fixedly connected with a rotary shaft of a motor through a coupling; a supporting column is fixed on the top cover on one side of the supporting shaft; and one ends of horizontal electric heating wires are fixed at the lower end of the supporting column while the other ends are fixed on the inner wall of the shell. By adoption of the detaching apparatus, convenience is brought for detaching the bottom insulating paper of a stator iron core groove, so that damage to the stator iron core in the subsequent detaching is reduced.