The invention discloses an anti-coking device of a coal injecting pipe. The anti-coking device of the coal injecting pipe comprises a scraper, a clamping part, a limiting plate, a cylinder and a driving mechanism, the cylinder is connected with the driving mechanism, and the driving mechanism drives the cylinder to rotate. One end of the clamping part is installed on the cylinder, the clamping part and the cylinder are located in a cavity body of the coal injecting pipe, and the scraper is rotatably installed at the other end of the clamping part. One end of the limiting plate is fixed to theinterior of the cylinder, the other end of the limiting plate is tightly attached to the side wall of the scraper, and the coal scraping end of the scraper is tightly attached to the end surface of the coal injecting pipe. The anti-coking device of the coal injecting pipe has the beneficial effects that the scraper can uninterrupted scrape the end surface on which an air outlet is located under the drive of a motor, so that the end surface of the air outlet is prevented from coking, the blockage of an air duct is avoided, the orderly conduct of cement calcination is ensured, and the productioncost is reduced; and the scraper is positioned through the limiting plate, the position of the limiting plate is unchanged from the relative position of the cylinder in the working process of the scraper, so that the position of the scraper is always unchanged, and the reliability of the device is improved.