Coal saver as well as preparation method and application thereof

The invention discloses a coal saver as well as a preparation method and application thereof. The coal saver consists of the following raw materials in parts by weight: 9-18 parts of potassium ferrate, 20-30 parts of poly-aluminum ferric silicate, 2-8 parts of potassium nitrate, 1-5 parts of sodium acetate and 10-18 parts of borax. The preparation method for the coal saver comprises the following steps: mixing and crushing the borax and poly-aluminum ferric silicate, enabling the mixed and crushed borax and poly-aluminum ferric silicate to pass through a 200-mesh sieve, and adding triethanolamine to carry out stirring treatment, thereby obtaining a pre-treated mixture of the borax and poly-aluminum ferric silicate; and mixing and ball-milling potassium nitrate and sodium acetate, adding potassium ferrate to mix and ball-mill, stirring and mixing with the pre-treated mixture of the borax and poly-aluminum ferric silicate, irradiating the pre-treated mixture by use of an ultraviolet lamp, and cooling to the roo