The vehicular advertisement device includes solar energy silicon board, frequency varying transformer, frequency increasing transformer, accumulator, motor, advertisement board comprising turnable triangular prisms on side of vehicle, etc. The double switch is powered with solar energy silicon board or AC power supply, and the motor rotates the advertisement board with three turnable sides. The present invention has the advantages of saving in power source, no pollution, wide advertising area owing to the moving vehicle, easy updating in the advertisement content, good visual effect, etc.