Uniform spraying device for repairing and protecting surface of ancient building

The uniform spraying device comprises a hollow rod, a sliding groove is formed in the front end of the hollow rod, a reciprocating lead screw is arranged in the hollow rod, a motor is installed at the right end of the reciprocating lead screw and located at the right end of the hollow rod, a reciprocating block is arranged on the outer surface of the reciprocating lead screw in a sleeved mode, and a connecting plate is installed at the front end of the reciprocating block. A plurality of hollow plates are vertically arranged in front of the hollow rod, the hollow plate in the middle is fixedly connected with the connecting plate, a plurality of nozzles are installed at the front end of each hollow plate, threaded heads are installed at the upper end and the lower end of each hollow plate, and a connecting threaded sleeve is arranged between every two adjacent threaded heads. The distance between the abutting plate and the spray head is adjusted so as to control the distance between the spray head and the wall