NOVELTY - A method for producing waste oil regenerated substitute fuel are provided to use the regenerated waste oils as a fuel for diesel engines or light oil boilers by regenerating waste oils including waste edible oil and waste animal oil and fat.    USE - For producing waste oil regenerated substitute fuel, as a fuel for diesel engines or light oil boilers by regenerating waste oils including waste edible oil and waste animal oil and fat.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a system for use in the above method, which comprises a raw oil storage tank (1) comprising a heating coil (2) for heating waste oils; a pretreatment tank (7) at the side of an outlet of the raw oil storage tank to pretreat the waste oils by adding a phosphoric acid solution to waste oils from which impurities are filtered through a centrifugal separator (4); multistage reactors (10) at the side of an outlet of the pretreatment tank and comprising multistage motors (8) for agitating the waste oils during methyl esterification of the waste oils; glycerin separators (11) at the side of an outlet of the multistage reactors to naturally separate a methyl esterified solution; a glycerin storage tank (12) downstream of the glycerin separators to store separated glycerin; an adsorption machine (15) at the side of an outlet of the glycerin separators to add adsorbent to the organic layer so that impurities in an organic layer are adsorbed by the adsorbent; a flocculator (17) at the side of an outlet of the adsorption machine to flocculate the adsorbent and the impurities by putting flocculant into the organic layer; multistage neutralization tanks (21) at the side of an outlet of the flocculator to neutralize the alkaline reaction solution by adding phosphoric acid (H3PO4) into a reaction solution; a cooler (22) at the side of an outlet of the multistage neutralization tanks to cool the reaction solution; membrane filter (23) and ceramic filter (24) at the side of an outlet of the cooler to filter impurities in the reaction solution; a sedimentation tank (25) at the side of an outlet of the membrane filter and the ceramic filter to completely remove glycerin and impurities; and an ester storage tank (26) at the side of an outlet of the sedimentation tank to store an impurity removed reaction solution.    DESCRIPTION OF DRAWING(S) - The drawing shows the above system.