The invention provides a segment crack repairing method. The segment crack repairing method comprises the following steps that construction preparation is conducted, specifically, cracks and fragmentation areas in a segment are sought along a shield tunnel, and identification tags are made on the cracks and the fragmentation areas; a plurality of circular holes are drilled in each crack, the depthof each hole is 10-15 cm, the diameter of each hole is 1.0 cm, and the distance between every two holes is 30 cm; grouting pipes are embedded in the circular holes correspondingly, the crack surfacesof the cracks are closed by using strong adhesives, and therefore the grouting pipes are tightly pressed and attached to the circular holes; the cracks are evenly coated with epoxy interface agents,and the grouting pipes are embedded by adopting high-early-strength cement and tightly pressed and filled; pouring of epoxy slurry is conducted on the grouting pipes in the circular holes sequentiallyto conduct grouting repairing, and the pouring pressure is 0.6-0.8 Mpa; secondary or multiple repeated grouting is conducted on the grouting pipes in the circular holes sequentially, and the groutingeffect is ensured; and filling and repairing are conducted along the fragmentation areas by adopting epoxy mortar in the fragmentation areas, and the repairing effect of the fragmentation areas is achieved.