The present invention provides a mask and a repairing method therefor. A reference area is selected in a configuration pattern of a mask template, the reference area is corresponding to a to-be-shaded area of a mask; a repair area is formed on a drillable member according to the reference area; a hollow area is formed in the repair area of the drillable member, the hollow area is corresponding to the to-be-shaded area; the drillable member is attached to the mask, the hollow area is corresponding to the to-be-shaded area; and shading material is coated on the drillable member, so as to form a shaded layer on the to-be-shaded layer.