Fabricated energy-saving building wall and mounting method

The invention discloses an assembly type energy-saving building wall and a mounting method, and relates to the field of assembly type buildings, and the assembly type energy-saving building wall comprises prefabricated wallboards and joint cast-in-place belts used for connecting the adjacent prefabricated wallboards; the side edge, used for being connected with the joint cast-in-place belt, of the prefabricated wall plate is defined as a connecting side, a reinforcing connecting assembly is arranged on the connecting side of the prefabricated wall plate and comprises a plurality of connecting ribs, the length direction of the connecting ribs is arranged in the height direction of the prefabricated wall plate, the connecting ribs are fixedly connected, and the connecting ribs are fixedly connected with the joint cast-in-place belt. The connecting ribs comprise pre-embedded ribs and outer connecting ribs, the pre-embedded ribs are embedded in concrete of the prefabricated wall panel, the outer connecting ribs a