The utility model belongs to the technical field of wallboards, and particularly relates to a partition wallboard with sound insulation and thermal insulation functions. Ann inner cavity of a frame with a rectangular cross section is divided into more than two rows of elongated holes by partition boards disposed in a crisscross manner, the left end and the right end of the frame are respectively provided with two projections having elongated cavities, the upper plane or the lower plane of each of the projections is level to the upper plane or the lower plane of the frame, and an elongated groove is formed between each two projections. The partition wallboard has the advantages of fine stability, fine water proofing, environment protection, beauty, high cost performance, sound insulation, thermal insulation, flame retardancy and processability evidently superior to that of individual wood and plastic products, reaches the design of hard wood standard templates, is light in weight so as to facilitate transportation, and is suitable for buildings, landscapes and the like.