The invention relates to a laminated rubber bearing void pre-warning device. In the past, a detector needs to reach a pier top through large equipment to perform naked-eye observation when detecting laminated rubber bearing void, and bearing void cannot be comprehensively discovered or pre-warned. A pressure sensor is arranged between the top surface of a laminated rubber bearing and an upper beam and serially connected with a warning light, the warning light is arranged on a pre-warning display, the pre-warning display is hung on the side of the beam, and the pressure sensor is a flaky pressure sensor. According to the laminated rubber bearing void pre-warning device, the detector can observe the force distribution state of the bearing and comprehensively discover bearing void without directly reaching the pier top for high-altitude operation or being affected by a bearing void position, possibility and development trend of bearing void can be pre-judged by daily and simply observing a pre-warning display system, a pre-warning function is achieved, accordingly, structural safety is ensured, and preventive measures are taken.