The invention discloses a billboard capable of automatically changing posters, including an advertising box, one side of the advertisement box is provided with a mounting groove, two shaft rollers arerotatably mounted in the mounting groove, and the two shaft rollers are drivingly mounted with the same advertisement cloth, the other side of the advertising box is provided with upright posts, a sliding groove is formed on the inner wall of one side of the mounting groove, a plurality of through holes are arranged on the inner wall of the side of the sliding groove close to the column, a positioning lever is movably installed on the inner wall of the bottom of the through hole, a sliding lever vertically arranged is slidably installed in the sliding groove, a first servo motor fixedly installed on the inner wall of the top of the mounting groove is arranged above the sliding lever, and an output shaft of the first servo motor extends into the sliding groove and is fixedly installed witha winding wheel. The invention has the advantages of reasonable design, convenient operation and control, and is convenient for circulating and rotating the advertisement cloth, thereby facilitatingthe display of different advertisement contents on the advertisement cloth, and facilitating the fixing of the advertisement box on the upright pillar at the beginning, thereby improving the installation efficiency.