The invention relates to a building sandwich thermal insulation board, and belongs to the technical field of building materials. The building sandwich thermal insulation board comprises a heat preservation plate body, a plurality of outer limiting convex bodies are evenly distributed on the outer side of the heat preservation plate body, a plurality of outer surface vertical grooves are verticallydistributed in the outer side of the heat preservation plate body, and a plurality of inner surface outer convex bodies and inner surface concave bodies are evenly distributed at the inner side of the heat preservation plate body. The thickness of an outer protection layer of the thermal insulation board is effectively limited, and the bonding force of protection concrete and the thermal insulation board is enhanced. Construction is convenient, construction waste is reduced, and manual work days are reduced. The project time limit is shortened, factory production is achieved, and the thermalinsulation board and a steel wire net frame are formed at the same time. The building sandwich thermal insulation board has the effects of heat preservation, heat insulation, fire prevention, water prevention, durability, sound insulation, sound absorption, corrosion prevention, land saving, material saving, time saving and service life prolonging.