The invention provides a gangue comprehensive utilization method. The method comprises the steps that: gangue is grinded into particles with a particle size smaller than or equal to 10mm; combustion is carried out in a fluidized bed roaster, and heat generated by combustion is used for civil use or industrial heat supply; additives are added to white inorganic ash after combustion; melting is carried out at a temperature of 1500-2000 DEG C; inorganic fiber is obtained by blowing melted mixtures or carrying out thread throwing upon the melted mixtures. According to the method provided by the invention, a technical route of complete utilization of the gangue is provided, and the technical route has great significance for methods and means of waste utilization development and additional value increasing of the gangue. The gangue comprehensive utilization method belongs to a new technology of the resource, energy cycle and regeneration utilization field; and by using the method, waste utilization efficiency can be improved and waste resources are fully utilized.