TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The step (i) further comprises controlling the temperature of the low-boiling-point substance at 40-90 degrees C, preferably 50-80 degrees C, more preferably 60-70 degrees C; controlling the weight ratio of the low-boiling-point substance to methyl alcohol as 1:0.6-1.2, preferably 1:0.8-1.1, more preferably 1: 0.9-1; and controlling the mixed flow normally at 0.1-20 tons per hour, preferably 0.5-5 tons per hour, more preferably 1-10 tons per hour. The step (ii) further comprises normally controlling pre-heating temperature at 200-230 degrees C, preferably 210-230 degrees C, more preferably 220-225 degrees C; controlling temperature of continuous esterification normally at 210-250 degrees C, preferably 215-235 degrees C, more preferably 220-225 degrees C; controlling pressure of continuous esterification normally at 3-5 MPa, preferably 3.5-4.5 MPa, more preferably 3.8-4.2 MPa; and controlling retention time of the continuous esterification normally in 2-12 hours, preferably 3-10 hours, more preferably 4-8 hours. The step (iii) further comprises controlling the vacuum degree of the scrapper film normally at 50-500 Pa, preferably 100-350 Pa, more preferably 150-200 Pa; controlling temperature of heat conductive oil of scrapper thin film distillation normally at 200-260 degrees C, preferably 210-250 degrees C, more preferably 220-240 degrees C; and inputting and outputting stable flow of the material and the product by the frequency conversion speed adjusting molecule in scrapper film distillation; and controlling the flow normally at 0.1-10 tones per hour, preferably 0.5-8 tones per hour, more preferably 1-5 tones per hour. The step (iv) further comprises controlling vacuum degree of short molecule distillation and residue elimination normally at 1-100 Pa, preferably 5-10 Pa, more preferably 10-20 Pa; controlling heat conductive oil of the short molecule distillation and residue elimination normally at 200-500 degrees C, preferably 210-240 degrees C, more preferably 220-230 degrees C; controlling temperature of circulation water in short molecule distillation and residue elimination normally at 20-70 degrees C, preferably 30-60 degrees C, more preferably 35-55 degrees C; feeding by a frequency conversion maag pump in stable flow manner in frequency conversion; controlling flow normally at 0.1-10 tones per hour, preferably 0.5-8 tones per hour, more preferably 1-5 tones per hour, and and using gravity liquid asphalt seal for continuous discharge of short molecules. The step (v) further comprises controlling baume degree of concentration of continuous alkali refining liquid normally at 12-26 baume degrees, preferably 16-24 baume degrees, more preferably 18-22 baume degrees; controlling temperature of continuous alkali refining normally at 50-95 degrees C, preferably 60-90 degrees C, more preferably 80-90 degrees C, mixing fatty acid methyl ester (FAME) with liquid alkali according to rationed proportion by a dynamic mixer in continuous alkali refining, delaying aging by a jar normally for 10-60 minutes, preferably 15-45 minutes, more preferably 20-30 minutes, eliminating nigre in a butterfly-type centrifuge, mixing and FAME with liquid alkali according to rationed proportion by a dynamic mixer in continuous alkali refining and then washing normally at 80-95 degrees C, preferably 85-93 degrees C, more preferably 88-92 degrees C, dehydrating by the butterfly-type centrifuge, dehydrating the continuous alkali refining FAME in vacuum, controlling vacuum degree normally at 720-760 mmHg, preferably 730-750 mmHg, more preferably 735-745 mmHg; and controlling dehydration temperature normally at 120-160 degrees C, preferably 130-150 degrees C, more preferably 135-145 degrees C.