The invention discloses a regularly-triangular combined surface same-unit space truss structure, which consists of 20 truss member units with completely same structures, sizes and models and 11 truss joint units with completely same structures, sizes and models, wherein each truss member unit comprises an upper chord member and a lower chord member which are positioned in the same plane, and a plurality of web members which are connected with the upper chord member and the lower chord member; the length of the upper chord member is larger than that of the lower chord member; and each truss joint unit consists of a member bar and same joints connected with the two ends of the member bar. In the space truss structure, the truss member units and the truss joint units are the same, so that batch production, packing and transportation of a plant are facilitated, and the production cost is lowered; convenience is brought to the installation of structures; any unit can be replaced by a standard element unit when being damaged during installation or use; and the regularly-triangular combined surface same-unit space truss structure is triangular, belongs to a geometrically-constant structural system, and has the advantages of high structural bearing capacity, high stability and high shock resistance.