The utility model discloses a device for scraping tar on the inner wall of a container. The device comprises a container, a rotating shaft, stirring plates and scrapers, a liquid outlet pipe is arranged at the bottom of the container; a liquid outlet pipe is arranged on the container, a liquid outlet valve is arranged on the liquid outlet pipe, a liquid inlet pipe is arranged on one side of the container, a liquid inlet valve is arranged on the liquid inlet pipe, an air cylinder is arranged above the container, a containing plate is arranged above the air cylinder, a motor is arranged on the containing plate, a connecting base is arranged below the motor, and a rotating base is arranged below the connecting base. Beneficial effects are that: the method is suitable for large-scale production; the tar scraping device is simple to adjust and operate; tar on the inner wall of the container can be effectively removed by adopting the staggered scrapers; the whole rotating shaft can be drivento ascend through the air cylinder, meanwhile, the scraper is driven to ascend, so that tar is removed in a larger range, the stirring plate and the scraper can be flexibly disassembled, installationand replacement are convenient, stirring is not affected in the scraping process of the whole device, and meanwhile sufficient reaction can be promoted.