Mould-locking assembled water-proof heat-insulating slab and construction method thereof

The present invention is one kind of tongue-and-groove assembled waterproof heat insulating board and its construction process. The waterproof heat insulating board consists of one upper waterproof decorating layer and one lower heat insulating waterproof layer combined through heat compounding or adhering. The upper waterproof decorating layer is cement fiber board, silicocalcium board, marble board, aluminum-plastic board or ceramic board; and the lower heat insulating waterproof layer with tongue-and-groove structure is made of foamed polystyrene, foamed polyethylene, foamed polyurethane, foamed polyvinyl acetate or foamed phenolic resin. During the construction, the waterproof heat insulating boards are assembled successively, and glue is applied to the joints. The present invention has simple structure, easy production, convenient construction, and good waterproof, heat insulating and decorating effects.