NOVELTY - Production of biodiesel comprises preparation of a homogeneous suspension of oleaginous seeds and an anhydrous alcohol to obtain an emulsion (A); addition of an alkaline alkoxide catalyst to (A), followed by the transesterification reaction to obtain a desired alkyl ester (B); filtration and separation; withdrawal of the alcohol by distillation; and drying and sieving to obtain carbohydrates for fermentation.    USE - The method is useful for the preparation of biodiesel for fuel using castor bean seeds as raw material.    ADVANTAGE - The method lowers the raw material cost by dispensing with the use of vegetable oils that require a preprocessing to be extracted from the seeds and then refined, utilizes a conventional fermentation process based on the carbohydrates present in the residual seed cake separated from the alcohol phase containing esters and glycerin, allows to reuse hulls, wastes and ashes produced during the seed cleaning, hulling and drying yielding a fertilizer that may be used in the castor bean seed culture, the main product of the invention used as a substitute for diesel, is less pollutant and provides petroleum savings.    DETAILED DESCRIPTION - Production of biodiesel comprises preparation of a homogeneous suspension of oleaginous seeds and an anhydrous alcohol (4:1-0.5:1) to obtain an emulsion (A) in a reactor (where the step is performed after processing and drying a feed of oleaginous seeds); addition of an alkaline alkoxide catalyst (0.1-5 wt.%) to (A), followed by the transesterification reaction for 30-90 minutes at 30-78 degrees C to obtain a desired alkyl ester (B) at 98-100% conversion; filtration and separation of the alkyl ester products to obtain a liquid phase and a solid phase; withdrawal of the alcohol from the liquid phase by distillation and decant the remaining phase, glycerin and (B); and drying and sieving from the solid phase to obtain carbohydrates for fermentation or cattle feeding and hulls for fertilizer formulation.