Ground marking repairing device and repairing method

The invention relates to a ground marking repairing device and method, and belongs to the field of road construction equipment. The device comprises a rack. A roughening mechanism, a dust cleaning mechanism, a coating mechanism and a reflective particle coating mechanism are sequentially arranged in the reverse walking direction of the rack; the roughening mechanism comprises a fixing frame, a roughening disc, a roughening roller and a driving part, the roughening surface of the roughening disc comprises an inclined surface and a plane, the inclined surface and the plane are arranged in the direction opposite to the walking direction of the rack, scraping teeth are arranged on the inclined surface, scraping knives with different lengths are arranged on the plane, and the driving part drives the roughening disc to conduct roughening, so that a plurality of spaced protrusions are formed on the surface of a marked line; the roughening roller grinds the surfaces of the multiple spaced protrusions; through roughen