The invention discloses a wind flag fixing device which comprises a pipe clamp and a flagpole. The wind flag fixing device is characterized in that the pipe clamp comprises an upper clamp and a lowerclamp, the flagpole is connected with the back surface of the upper clamp, and a wind flag is arranged on the upper side surface of the flagpole; the upper clamp is connected with the lower clamp by bolt and nut structures. A spring is arranged between the upper clamp and the flagpole. The wind flag fixing device has the advantages that the wind flag fixing device comprises the pipe clamp and theflagpole, the pipe clamp can be fixed to a shaft shoulder of detection equipment, and the wind flag is fixed to the top of the flagpole to indicate wind directions; the wind flag fixing device is light and is simple in structure and convenient to assemble, and the cost can be reduced.