Prefabricated wallboard

The utility model discloses a prefabricated wallboard which comprises a wallboard connecting plate and a first supporting plate, a mounting frame is arranged at the lower end of the wallboard connecting plate, a first heat insulation plate is arranged at the upper end of the interior of the mounting frame, a second heat insulation plate is arranged at the lower end of the interior of the mounting frame, and the first supporting plate is arranged at the lower end of the mounting frame. When the prefabricated wallboard is used, the first heat insulation plate, the vacuum interlayer and the second heat insulation plate jointly block heat transfer, the device facilitates improvement of the heat preservation capacity of the wallboard, the weight of the non-bearing part of the wall can be reduced, external noise is weakened by the vacuum interlayer and the sound insulation cotton when passing through the wallboard, and the device can prevent the clamping head from being directly exposed in the air; according to the