The invention provides a method for mending flying shear eccentric shaft abrasion and belongs to the technical field of rolling equipment maintenance methods. The method for mending the flying shear eccentric shaft abrasion is used for carrying out mending on an abraded flying shear eccentric shaft. The technical scheme is characterized in that the method for mending the flying shear eccentric shaft abrasion includes the steps: enabling matching surfaces of two new half steel jackets which need putting on a machine to be abraded 0.2 mm-0.3 mm, guaranteeing pre-tightening force on the flying shear eccentric shaft when the two new half steel jackets are fastened, selecting strip-type steel strips with the appropriate size by measuring abrasion loss of the flying shear eccentric shaft, and enabling the strip-type steel strips to be pressed tightly between two half steel strips and the lying shear eccentric shaft to make up a gap generated after the flying shear eccentric shaft is abraded. The method for mending the flying shear eccentric shaft abrasion resolves the problems which are difficult to resolve for a long time in a simple mode and is original inland. After the method for mending the flying shear eccentric shaft abrasion comes into use, loss on production under the condition that large abrasion loss of the flying shear eccentric shaft happens and replacing of the flying shear eccentric shaft can not be made is effectively made up, work time of examining and mending is shortened greatly, a flying shear is enabled to be applied as soon as possible, no abrasion happens within one year after the flying shear is applied, and service cycle of the fly shear is greatly prolonged.