The invention discloses a repair method for unqualified semi-finished closestools. The repair method for the unqualified semi-finished closestools comprises the following technological processes of repairing material preparation, cleaning, defective material preparation and sintering, specifically, repairing materials including hairbrushes, glaze and fiber paper are prepared, the defective surfaces of the unqualified semi-finished closestools are cleaned completely, coating is prepared from the glaze and water in proportion, the fiber paper is cut according to the sizes of defects, the coating is evenly brushed on the fiber paper with the hairbrushes, the fiber paper is stuck to the defects, and finally the repaired unqualified semi-finished closestools are stored in a kiln for sintering. The repair method for the unqualified semi-finished closestools is simple in operating and can be suitable for large-scale repairing, cost is reduced, and the qualification rate of finished semi-finished closestools is increased.