The invention provides a gear-grinding and crack-removing repair method and relates to a gear grinding method. The gear-grinding and crack-removing repair method aims at solving the problem that an existing grinding and crack-removing method easily causes an out-of-tolerance phenomenon and crack extending and accordingly causes gear scrapping. The gear-grinding and crack-removing repair method comprises the steps that 1, crack positions are colored to identify the crack positions and crack trends, the crack positions are roughened by using raw emery paper, then grinding is performed in the crack directions by using a circular-arc-shaped oilstone, and it is noted to ensure that that the sizes cannot be out of tolerance in the grinding process; 2, after the cracks are eliminated, single-face grinding is conducted on the gear faces having defects of gears till the defects are eliminated, and then the allowance of two gear faces of each gear is re-calculated. By means of the gear-grinding and crack-removing repair method, cracks can be eliminated just right. In a single-face grinding mode, mutual equilibrium can be achieved through the other side once the out-of-tolerance phenomenon occurs on one side, the out-of-tolerance phenomenon easily caused by double-face grinding can be prevented, implementation of further machining is ensured, and the product quality is ensured. The gear-grinding and crack-removing repair method is used for repairing gear cracks.