The utility model discloses a waste rubber layer scraping device for a waste rubber conveyer belt. The waste rubber layer scraping device comprises a gantry rack fixedly mounted on the production line, wherein a scraping blade with an inclined cutting edge is mounted on the gantry rack, a supporting roller is arranged below the cutting edge of the scraping blade in parallel, and a to-be-scraped conveyer belt moves in and penetrates through a gap between the cutting edge and the supporting roller in the direction facing the cutting edge. According to the waste rubber layer scraping device, the scraping blade with the inclined cutting edge is mounted on the gantry rack, the supporting roller is arranged below the cutting edge of the scraping blade in parallel, when the to-be-scraped conveyer belt moves in and penetrates through the gap between the cutting edge and the supporting roller in the direction facing the cutting edge, relative movement produced between the conveyer belt and the scraping blade is utilized, main scraping force is applied simultaneously, the cover rubber layer of a to-be-processed conveyer belt is scraped, the cover rubber layer is rapidly and effectively removed, the next procedure is facilitated, the integrated degree is high, and the operating efficiency is substantially improved.