The utility model discloses an online casting blank burring device, including fixed bolster, joining chain, counter weight plate and scraper, the scraper sets up the counter weight plate bottom, counter weight plate utilizes the joining chain hoist and mount are in the lower part of fixed bolster. The utility model discloses the burr of casting blank upper surface got rid of to the batch in succession, has guaranteed the quality of continuous casting billet, improves production board material volume and lumber recovery.