The invention discloses environment-friendly energy-saving extra-strong combustion-supporting high-efficiency synthetic coal, which is characterized by comprising the following steps: adopting plant charcoal power and natural coal powder of powerful renewable resources to prepare into a main material through a scientific formula according to the variety and the quality of coal; adding a mixed material of coal gangue powder and fly ash powder of industrial waste to synthesize a filling auxiliary material, and reconstructing and changing structures, the performance and the characteristics of the coal to make the coal reach the highest efficiency; then adding a strong-oxygen combustion-supporting high-efficiency coal-saving synergistic fire-slowing agent which has quick firing, can prolong the combustion time of the coal, can make low-grade coal completely combusted, improve thermal efficiency, save the coal, has no pollution, and can achieve the aims of eliminating smoke, dedusting, supporting combustion and desulfurizing; and finally adding a certain amount of water , evenly stirring , and performing coal molding and manufacturing by special coal-making machinery . The coal is high-efficiency coal, has the use efficiency three to six times of that of the prior ordinary coal, is a novel energy-saving high-efficiency energy source, has the coal-saving rate reaching 80 percent or so, has extremely high coal-saving rate and convenient use, is safe, reliable and easy to store, and is called 'overground coal mine' and 'green coal'.