The invention discloses an improved regeneration technique for decolorizing and deodorizing waste tyre oil and a method for preparing
diesel fuel thereof, which comprise the following steps: a, mixing 100 parts of waste tire oil, 1-8 parts of
hydrogen peroxide and 1-5 parts of core catalyst, and reacting for 2-5 hours after mixing, wherein the core catalyst is the mixture of at least two components selected from Fe2O3, Al2O3, SiO2 and MnO2; b, adding
anhydrous materials at the upper layer after reaction in the step a to a reaction kettle, adding the core catalyst, heating, and extracting distillate at 365 DEG C under the normal pressure or at 280-300 DEG C under 0.09 MPA negative pressure; c, adding concentrated sulphuric acid to the distillate obtained in the step b, stirring, adding argil for precipitating, and filtering by a
filter press or filter sands to obtain pale yellow primary diesel oil; and d, preparing the primary diesel oil obtained in the step c to a desired type of diesel oil. Compared with the prior art, the invention adopts a more improved reaction principle, and the product oil prepared by the method has the advantages of pale yellow color, stable quality, favorable evaporability and
power performance, low temperature flow property, non-corrosiveness, and the like; furthermore, the product oil has the
advantage of preparing the diesel oil by mixing with the traditional fossil diesel oil or other fuel diesel oils according to any proportion.