TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: In the method above, the extract method of the shell and total saponine is as follows: mixing shell or oil slag and 55-80% ethanol according to that proportion of material to liquid is 1:3-10 (w/v), heating at 60-80 degrees C till refluxing; or extracting for 2-5 times by supersonic wave, microwave; every time is 10 minutes to 5 hours; filtering, combining extracted liquid; vaporizing filter liquid to remove ethanol; using 2-4 times of water to dissolve; filtering, using isometric n-butanol to extract filter liquid for 2-5 times; combining n-butanol phase, vaporizing to remove n-butanol, obtaining total saponine. Production process of the cellulose by shell and peel is as follows: mixing shell residual slag after crushing peel or extracting saponine and 0.5-2.5% dilute sulfuric acid or dilute hydrochloric acid according to that of material to liquid is 1:5-15 (w/v); pre-treating for 10 minutes to 3 hours at 90-300 degrees C; making the removal rate of the cellulose be 85-100%; filtering, using semicellulose to hydrolyze filter liquid, obtaining reducing sugar; using ammonia water, sodium hydroxide to regulate pH to 4.0-5.0; using cellulase to hydrolyze, saccharify and ferment solid slag to product ethanol; the cellulose saccharifying and fermenting process is as follows: sub-step hydrolyzing, saccharifying and fermenting method (SHF), synchronous saccharifying and fermenting method (SSF), integration biological process (CBP); the microorganism used during the ethanol fermentation process comprises Saccharomyces cerevisiae, Pichia stipitis, Candida shehatae, Pachysolen tannophilus, Zymomonas mobilis, Escherichia coli, Klebsiella oxytoca, Fusarium oxysporum, Clostridium thermocellum, and modified gene engineering bacterium; the temperature for producing ethanol by strain fermenting is 30-70 degrees C; pH is 4.0-5.0. The extract method of the seed oil is as follows: pressing or low-polar organic solvent n-hexane, petroleum ether to carry out extract with help of microwave and ultrasonic; when using organic solvent to carry out extracting, mixing crushed seed and solvent according to that the proportion of material to liquid is 1:5-15 (w/v), extracting for 4-6 times; every time is 10 minutes to 5 hours; recovering solvent. The ethanol for producing biodiesel is cellulose ethanol produced by shell and peel; the condition of the ester exchange of the seed oil and ethanol is as follows: the mol ratio of the ethanol to seed oil is 3-40:1; the catalyst is alkali catalyst, acid catalyst or enzyme catalyst; the dosage of the catalyst is 0.1-10% seed oil; the temperature of the ester exchange is 20-120 degrees C; the reaction time is 0.5-24 hours. The by-product glycerine of the biodiesel is used for producing 1,3-propylene glycol by microorganism fermentation; the microorganism is Klebsiella pneumoniae, Citrobacter freundii and Clostridium butyricum; the inoculation amount is 5-20% during the fermenting process; the concentration of the primary glycerine is 2-15%; pH is 6.0-80; carrying out anaerobic or anoxic fermenting at 30-40 degrees C. The ethanol produced by shell and peel can be recycled in biodiesel production, saponine extraction and double-water-phase extraction of the 1,3-propylene glycol.