Height-adjustable rubber fender

The invention discloses a height-adjustable rubber fender, and particularly relates to the technical field of rubber fenders. The rubber fender comprises a first rubber block and a second rubber block, wherein a protective film is arranged above the first rubber block, the second rubber block is arranged above the protective film, a force release piece is fixedly installed on the upper surface ofthe second rubber block, and a locking piece is arranged on one side of a driving piece. According to the invention, a pull rod is pulled outwards, a positioning rod is separated from a positioning hole in a rack at the moment, the locked state of the rack is released; and then a driving gear on a rotating rod drives the rack to move on a guide rail so as to adjust the second rubber block upwards,then the automatically reset pull rod drives the positioning rod to be inserted into the positioning hole, locking of the whole device is completed, so that the stability of the whole device after adjustment is guaranteed, gr