A paper doctor blade device relates to an improvement of a doctor blade device that can successfully scrape coated thin paper from a coating shaft by an oil coater doctor blade device. The scraper improvement device includes an optimum gap between the scraper and the coating roller, and the scraper is kept parallel to the coating roller. The rake angle of the scraper is consistent with the cutting wire angle of the coating roller. The rake angle of the blade is consistent with the tangent angle of the coating roller. The paper scraper device can successfully scrape more than 60 grams of thin paper, effectively meet the requirements of users, greatly improving the use of polishing machine.