The invention discloses a split mounting type heat preservation building board. The split mounting type heat preservation building board comprises square frames, a heat preservation layer, a buffer
protection layer and an outer
protection layer, wherein limiting inner frames are arranged in one sides of the square frames, packaging
layers are arranged on the sides, close to the limiting inner frames, in the square frames in a matched mode, the side faces of the packaging
layers are provided with embedded decoration
layers matched with the inner sides of the limiting inner frames, and the adjacent square frames are assembled and connected together through assembling units; the heat preservation layer is arranged on the side, close to the packaging layer, in the square frame; the buffer
protection layer is arranged on the side, close to the heat preservation layer, in the square frame, and the buffer protection layer is clamped and fixed to the inner side of the square frame through a buffer protection layer fixing
assembly; and the outer protection layer is installed on the side, away from the heat preservation layer, of the buffer protection layer through a buckle
assembly, a gap is reserved between the bottom of the outer protection layer and the bottom of the inner side of the square frame, and an outer protection layer disassembling and supporting
assembly is installed in the gap. A multi-layer structure is adopted, the environment-friendly effect of reducing heat loss is achieved, meanwhile, external collision can be buffered, the damage probability is reduced, the connecting gap is small, and the heat preservation effect is good.