The invention belongs to the technical field of decoration wall surface repairing and particularly provides a wall surface crack repairing method. The problem that after a wall surface crack is repaired, cracking is still prone to occurring is solved. The wall surface crack repairing method comprises the following steps that S1, water is evenly sprayed on the wall surface where the crack is located, thus the wall surface is wetted, and then the wall surface where the crack is located is chiseled away till the cement mortar wall surface is exposed; S2, a base of the wall surface where the crackis located is chiseled into a U shape, and the chiseled base is roughened; S3, a plurality of planted bars are embedded into the position between the two side walls of the U-shaped base in S2 in a crossing mode; S4, the chiseled base is filled with a caulking gypsum combination, attention to clearing of excess materials is paid, and thus a caulking gypsum layer is not higher than the cement mortar wall surface; S5, after the caulking gypsum layer is dried and solidified thoroughly, a caulking strip is pasted; and S6, leveling is conducted outside the caulking strip through putty, then coatingis brushed, and thus the crack repairing position and the periphery are naturally joined. After crack repairing, the advantages that cracking again is prevented, and the appearance is flat and natural are achieved.