The invention provides a prefabricated panel, relates to the technical field of panels for prefabricated buildings, and aims to avoid resource waste, reduce on-site construction pollution and improve on-site assembling efficiency. The prefabricated panel mainly adopts the technical scheme that the prefabricated panel comprises a first keel, two constructional plates, a first heat insulation plate and decorating plates. The first keel comprises a supporting part, a first fixing part and a second fixing part, the first fixing part and the second fixing part are respectively arranged at the two ends of the supporting part; the two constructional plates are respectively connected with the first fixing part and the second fixing part, and the two constructional plates form a first accommodating space; the first heat insulation plate is arranged inside the first accommodating space; the first heat insulation plate is in contact with both of the constructional plates; the decorating plates are arranged on the constructional plates and on the sides, opposite to the side in contact with the first keel, of the constructional plates.