The invention discloses a fixing structure for cleaning a curved roof. The fixing structure comprises a Halfen groove fixedly welded in the extending direction of a fixed supporting rod. Brackets are fixedly welded on the two sides of the fixed supporting rod correspondingly and fix fixed steel bars at the bottom of a curtain wall plate through fixing angle steel bars. The fixed steel bars are fixed to the curtain wall plate through connecting rods. A bolted cap of a fixing bolt is arranged in the Halfen groove. The fixing bolt is fixed to a fastening seat through a fixing nut. A fixed sleeve is formed integrally on the fastening seat and detachably connected with a safety rope fixing piece. The safety rope fixing piece comprises an inserting tube matched with the fixed sleeve. The fixing structure can be dismantled and mounted according to requirements, mounting is fast and convenient, the mounting position can be adjusted according to the actual situation, and the defect that overlarge or insufficient compression force produced by common thread connecting is overcome.