The invention discloses an advertisement display device. The device comprises a water injection base, and a water injection end cover is clamped to and fixedly connected to the middle of the upper surface of the water injection base through threaded grooves; display brackets B are arranged at the two sides of the upper surface of the water injection base, a connecting screw rod is rotatably connected to one end of each display bracket B through a bearing, and the connecting screw rods are clamped and fixedly connected with the water injection base through threaded grooves; the other end of each display bracket B is provided with a display bracket A, a steel ball spring is fixedly connected into one end of each display bracket A through welding, and fixed steel balls are fixedly connected to one end of each steel ball spring through welding. According to the advertisement display device, through the design of the adjustable display brackets A and B installed on the upper surface of thewater injection base, adjustment can be conveniently conducted according to the size of an advertisement board, and the problems are solved that existing advertisement display devices are monotonous in size, cannot be adjusted according to the size of an advertisement and do not have diversity.