The utility model relates to the technical field of sign post frames, and discloses a height-adjustable road sign post frame which comprises a supporting
pipe, a sign frame arranged on one side of the supporting
pipe and an adjusting
assembly arranged in the supporting
pipe and used for adjusting the height of the sign frame. Through mutual cooperative use of a supporting pipe, a card frame, a moving plate, a roller supporting frame, a first steel
wire rope and a moving bin, the effect of adjusting the height of the card frame can be achieved, the rotating resistance of a winding drum is reduced through a counterweight balance
system, and under cooperation of the roller supporting frame and the first steel
wire rope, the moving plate and the card frame reach the target height; by means of the
speed reduction and self-locking structure, other operations are not needed when the worm rotates, multi-person cooperative operation is not needed, manpower is saved, meanwhile, safety is guaranteed through the self-locking structure, safety is guaranteed by screwing a bolt into a threaded groove to fix the worm gear, and the worm gear is practical.