The invention relates to the repairing field of slab ballastless tracks, in particular to a method for repairing a slab ballastless track in a turnout zone. A plurality of cross beams crossing all base plates are erected above the turnout zone track; vertically-downward acting force is applied to the middles of the cross beams to enable the middles of the cross beams to be bent downwards to generate pre-deformation; after pre-deformation is completed, all the base plates are leveled to be in the same plane, and then the cross beams and the base plates are connected into a whole through rods; the two ends of each cross beam are ejected vertically to enable the cross beams to drive the base plates to ascend to adjust the vertical position of the base plates; then the base plates are pushed horizontally and transversely to adjust the transverse position of the base plates; after adjustment, mortar is poured below the base plates; and after the mortar is solidified, the base plates are put down to complete repairing construction. According to the method, through a center hole jack, the bending deflection of the middle portions of the cross beams is removed, and the lifting heights of all the base plates in the turnout zone are kept consistent; and the structure is simple, mounting is convenient, and a great popularization value is achieved.