NOVELTY - Production of biodiesel involves peeling skin of rutaceae citrus fruit, crushing the seeds, adding 8-10 wt.% soft water, heating, pressing the resultant cake material, obtaining crude oil, adding 5-15 %mass p-toluenesulfonic acid and methanol, reacting, maintaining the resultant reaction mixture, introducing the resultant upper layer of oil into an another reactor, adding solution containing catalyst and methanol, obtaining reaction mixture, maintaining, discharging the resultant lower layer of crude glycerine and methanol and rectifying the resultant upper layer of raw biodiesel.    USE - Production of biodiesel (claimed).    ADVANTAGE - The method efficiently provides biodiesel.    DETAILED DESCRIPTION - Production of biodiesel involves peeling skin of rutaceae citrus fruit, crushing the seeds, adding the 10-20 wt.% resultant crushed seeds into a reactor, heating at 60-75 degrees C for 30-50 minutes, softening the seeds, increasing the temperature to 105-115 degrees C, adding 8-10 wt.% soft water, mixing for 15-25 minutes, heating at 98-102 degrees C, pressing the resultant cake material at 33-38 degrees C, squeezing, filtering the resultant oil to remove impurities, obtaining crude oil (A), adding the obtained crude oil into another reactor, adding 5-15 %mass p-toluenesulfonic acid and 20-50 %mass methanol, stirring uniformly, reacting at 60-70 degrees C for 4-8 hours, obtaining reaction mixture, maintaining the obtained reaction mixture for 1-4 hours in a stratified tank, introducing the resultant upper layer of oil into an another reactor, adding aqueous solution containing 0.5-2 %mass catalyst and 15-30 %mass methanol, stirring uniformly, reacting at 45-65 degrees C for 2-4 hours, obtaining reaction mixture, introducing the obtained reaction mixture into the stratified tank, maintaining for 1-4 hours, discharging the resultant lower layer of crude glycerine and methanol, transferring the resultant upper layer of raw biodiesel into water washing kettle, stirring at normal temperature for 1-5 minutes, maintaining for 1-2 hours in the stratified tank, discharging lower layer of salt water and soap, washing the resultant upper layer of crude biodiesel, rectifying and collecting fraction at 270-310 degrees C. The catalyst is sodium hydroxide, potassium hydroxide or calcium hydroxide. The cake material after pressing and obtaining crude oil (A) is used as fertilizer raw material.