The invention provides a repairing method of inconstant cracks of a concrete building body. The method comprises the steps of step one, crack marking; step two, groove forming along the cracks; step three, hole drilling in oblique directions; step four, groove top sealing; step five, glue injection mouth installing; step six, glue injection; step seven, surface finishing. The method has the advantages that the difficult problem of the repairing of the inconstant cracks on the concrete building body is solved, a communicated space is created for the glue injection process of the cracks so thatglue can completely fill cracking regions, the repairing effect of the inconstant cracks on the concrete building body is significantly improved, the durability and safety of a concrete structure is enhanced, the operation is convenient, construction is easy, the repairing construction efficiency is high, large equipment is not needed, construction can be conducted in various complicated environments, and the cost is lower.