The invention relates to the technical field of building boards, and discloses a
building energy-saving decorative board which comprises a first energy-saving decorative board body, a second groove is formed in one side of a second energy-saving decorative board body, a lamp tube and a supporting block are fixed in the second groove, a sleeve is fixed to one side of a decorative picture body, and the sleeve is connected with the first energy-saving decorative board body. The sleeve is connected to the outer side of the supporting block in a clamped mode. According to the energy-saving decorative plate for the building, when the decorative picture main body is mounted, the sleeve needs to be clamped on the outer side of the supporting block, and the clamping block is automatically clamped into the clamping hole, so that the sleeve is locked, the decorative picture main body is locked, the decorative picture main body can play a role in decoration, and the display effect of the decorative picture main body can be enhanced by lighting a lamp tube; before the decorative picture body is disassembled, two rotary knobs need to be rotated, two lead screws need to be rotated, two first pistons move rightwards, each first
piston moves rightwards to drive two second pistons to move downwards, four clamping blocks all move downwards and leave clamping holes, then a sleeve can be unlocked, and then the decorative picture body can be disassembled.