NOVELTY - A synthetic biodiesel loaded sodium meta-aluminate/magnesium oxide solid alkaline catalyst is prepared by dissolving sodium meta-aluminate in de-ionized water, adding magnesium oxide powder to sodium meta-aluminate solution, stirring and statically aging the mixture, and removing water from the solution; roasting the dried product in muffle furnace for 4-10 hours at 200-1100 degrees C, and obtaining solid alkali; and scattering the solid alkali in plasma field.    USE - Method for preparation of NaAlO2/MgO solid alkaline catalyst for synthesizing biodiesel (claimed).    ADVANTAGE - The method is simple. The prepared catalyst has high activity and long circulation and service life, without the emission of waste liquid, thus, is environmental friendly.    DETAILED DESCRIPTION - Preparation of synthetic biodiesel loaded sodium meta-aluminate/magnesium oxide (NaAlO2/MgO) solid alkaline catalyst, comprises dissolving NaAlO2 in de-ionized water, adding MgO powder to NaAlO2 solution, a mole ratio of NaAlO2:MgO being 1:1-5, stirring for 1-4 hours, statically aging the mixture, and removing water from the solution by using rotary evaporator; roasting the dried product in muffle furnace for 4-10 hours at 200-1100 degrees C, and obtaining normal loaded NaAlO2/MgO solid alkali; and scattering the loaded NaAlO2/MgO solid alkali in plasma field, with air or nitrogen gas as barrier medium, at 20-45V, adjusting discharge gap to 1-10 mm, treating the loaded NaAlO2/MgO with plasma for 5-40 minutes, and obtaining the loaded NaAlO2/MgO solid alkali. An INDEPENDENT CLAIM is included for synthesizing biodiesel with the loaded NaAlO2/MgO solid alkali comprising adding grease and alcohol to a reactor, adding the loaded NaAlO2/MgO solid alkali, stirring at 30-220 degrees C and 60-400 rpm, obtaining mixture of biodiesel, filtering the mixture, recycling the filtered solid catalyst, statically layering the filtrate for biodiesel and coarse glycerin, and recycling methanol by distillation.