The invention provides a highly-efficient energy-saving low-carbon wall board and a manufacture method thereof. At present, clay, non-clay bricks, brick panels and the like are used as a main body construction in a building envelope wall body, secondary insulation construction is carried out by using a foam material in the insulation measure, and the main body construction and the foam material have high carbon dioxide discharge. The invention has the key point that plant fibers are used as a main material in the main body of the wall board, and the wall board is internally provided with three interlayers of an insulation layer, an air space layer and an insulation layer. Compared with the conventional energy-saving wall body and the roof board, the invention has the advantages of high energy saving effect, low heat transmission coefficient and good sound isolation; and the carbon discharge is reduced by about 60 percent compared with the traditional wall body, and the building energysaving ratio can reach above 65 percent.