A highly efficient and energy-saving building roof panel manufactured by industrialized production comprises an outer layer (1) and an inner layer (2). The outer surface of the outer layer (1) is a planar or curved face structure or a tile-shaped structure; a middle structural layer (3) composed of a thermally insulating organic material is arranged between the outer layer (1) and the inner layer (2); when the middle structural layer (3) is provided as one layer, both sides of the middle structural layer (3) are in direct contact with the outer layer (1) and the inner layer (2), or thermally insulating layers (6) are provided between the middle structural layer (3) and the outer layer (1) and between the middle structural layer and the inner layer (2); and when the middle structural layer (3) is provided as two or more layers, a separating layer (77) composed of composite cement or concrete is provided between two middle structural layers (3). The roof panel has a durable structure, is not susceptible to ageing, and has a good thermal insulation effect.
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