The invention relates to automatic conveying and clearing equipment for building materials. The automatic conveying and clearing equipment comprises a base plate. A clamping movable device is mountedat the front end of the base plate. A contaminant removal cleaning device is mounted at the rear end of the base plate. The clamping movable device comprises two clamping electric sliding blocks mounted on the base plate. The two clamping electric sliding blocks are symmetrically located at the left side and the right side of the base plate. Each clamping electric sliding block is provided with aclamping adjustment plate. Each clamping adjustment plate is provided with a clamping lifting air cylinder. The top end of each clamping lifting air cylinder is mounted on a clamping movable plate through a flange. By means of the automatic conveying and clearing equipment, the problems that when sheltering waterproof cloth at sandpiles at a construction site is cleared manually, the sheltering waterproof cloth needs to be conveyed to designated working positions to be cleaned manually, impurities, such as sludge, on the sheltering waterproof cloth need to be cleared away manually, the sheltering waterproof cloth needs to be cleaned manually, and impurities, such as the sludge, congealed into blocks need to be scraped off manually through existing tools can be solved.