The invention relates to the field of roll processing methods, in particular to a roll repairing method for a blooming mill. The roll repairing method effectively overcomes the defects that cracks, inclusions and air holes still exist in a repaired roll, thereby greatly improving the repairing quality. The method comprises the following steps that a, firstly, cast steel or forged steel rolls whichhave been scrapped in production of the blooming mill are collected; secondly, turning is carried out on the collected cast steel or forged steel rolls, which have been scrapped, of the blooming mill, and fatigue layers of the rolls are removed clean through turning; and C, finally, welding material layers are arranged on the surfaces of the new rolls formed after the fatigue layers are removed clean through turning. According to the roll repairing method for the blooming mill, various defects such as internal cracks, inclusions and air holes which may occur after repair are fundamentally eliminated; and on the basis of the defects, the repair can be well realized by adding the welding material layers, so that the service life of the repaired rolls is greatly prolonged. The roll repairingmethod is particularly suitable for repairing the rolls of various blooming mills.