Novel energy-saving building wallboard

The invention discloses a novel energy-saving building wallboard, which relates to the field of construction and building materials. A connecting plate (6) opposite to a connecting rod (5) is arranged on the inner side of a second side plate (2), a through hole opposite to the connecting rod (5) is formed in the connecting plate (6), the outer end of the connecting rod (5) is fixedly connected to the connecting plate (6) through a connecting gasket (7) and a connecting nut (8), an end face connecting plate (9) is arranged at the lower end of the second side plate (2), a welding preformed hole (10) is formed in one side of the end face connecting plate (9), an external wall decoration material (11) is arranged on the outer surface of a first side plate (1), a welding connecting plate (12) is arranged at the lower end of the first side plate (1), and a welding operation hole (12) opposite to the welding connecting plate (12) is also formed in the lower end of the first side plate (1). The novel energy-saving building wallboard is simple to construct, convenient to install, short in period, free of weather effect, small in space occupation, good in heat preservation effect, low in cost and good in heat insulation effect.