The invention belongs to the technical field of billboard, in particular to a taxi billboard, the taxi billboard comprises a base, a triangular billboard, an adjusting mechanism and a wind energy mechanism, wherein the triangular billboard can stop rotating and switching when the taxi is traveling at high speed and intermittently rotating and switching when the taxi is traveling at low speed, so that the triangular billboard can effectively propagate three advertisements and greatly increases the advertisement benefit; and the triangular billboard comprises a base, a triangular billboard, an adjusting mechanism and a wind energy mechanism. In addition, the driver may push the pushed ring by rotating the adjustment ring, so as to increase the compression amount of the first spring, so thatthe time of the first rotating shaft passing through the scroll spring, the driving cylinder and the triangular lever successively crossing the limit block is longer and longer, and the frequency of the driving cylinder driving the triangular billboard to rotate and switch is slower, so as to satisfy the propaganda effect of the triangular billboard under different conditions. The invention has the advantages of simple structure and good use effect.