The invention discloses an anti-separation heat preservation wallboard. The anti-separation heat preservation wallboard is of a layered structure and is composed of a heat insulation layer, an inner plate, a middle layer, an outer plate, gridding cloth and a panel which are sequentially arranged. The heat insulation layer is pasted to the inner plate. The middle layer and the panel are both made from mortar. A plurality of through holes are drilled in the outer plate. A surface layer and the middle layer are fused into a whole through mortar which penetrates through the through holes. According to the anti-separation heat preservation wallboard, through the mode that the surface layer is directly made from the mortar which is the same as the mortar of the middle layer and the holes are drilled in the outer plate, the surface layer and the middle layer are directly fused into the whole, and separation between all the layers of the wallboard of the layered structure is effectively prevented; a coloring agent can be directly added into the mortar of the surface layer to make a chromatic surface layer, and a decorative effect is directly achieved; and aluminum foil is used as the heat insulation layer, the advantages of low weight, easy arrangement and good heat insulation effect are achieved, cement-based polyphenyl heat preservation particles are added into the mortar of the middle layer, the heat insulation performance of the wallboard can be further improved, and the weight of the wallboard is decreased.