Building board cleaning device

The utility model relates to the technical field of plate cleaning devices, in particular to a building plate cleaning device which can automatically straighten plates and reduce the labor amount of workers and comprises a plate cleaning machine, a conveying belt is arranged at the inlet end of the plate cleaning machine, and a plurality of mounting frames are arranged at the top ends of the two sides of the conveying belt. An air cylinder is arranged at the top of each mounting frame, a connecting block is arranged at the telescopic end of each air cylinder, mounting blocks are arranged on the two sides of the conveying belt, the mounting blocks are fixedly connected with the corresponding connecting blocks, mounting grooves are formed in the mounting blocks, a plurality of rolling shafts are arranged in the mounting grooves, and electromagnetic valves are arranged on the side walls of the two sides of the conveying belt. Connecting pipes are arranged between the electromagnetic valves and the air cylinders,