NOVELTY - Preparing vehicle biofuel, biogas and fertilizer using microalgae full component comprises (i) inoculating microalgae into culture solution, and culturing to obtain microalgae culture solution; (ii) adding guanidine chitosan to the microalgae culture solution, stirring, discarding supernatant, and collecting microalgae; (iii) drying, crushing, adding mixed solvent, stirring, centrifuging, distilling the solution-containing algae oil, and extracting; (iv) preparing immobilized full cell catalyst; (v) carrying out catalytic transesterification reaction; and (vi) carrying out pyrolysis process.    USE - The method is useful for preparing vehicle biofuel, biogas and fertilizer using microalgae full component (claimed).    ADVANTAGE - The method: utilizes ocean algae and freshwater algae and other raw materials; has strong adaptability; collects algae using natural polymer flocculant; reduces utilization of inorganic flocculants, which pollutes the environment and product; provides by-products including gaseous products, which is rich in carbon monoxide, hydrogen and methane, and algae residue; produces ecological slow-release fertilizer; fully utilizes algae components; and utilizes transesterification catalyst, which is stable and environmentally-friendly, and has high efficiency and high repeatability without polluting the environment.    DETAILED DESCRIPTION - Preparing vehicle biofuel, biogas and fertilizer using microalgae full component comprises (i) inoculating microalgae into culture solution to make microalgae concentration to 8-12 mg/l, illuminating at temperature 20-35 degrees C to culture for 12-17 hours, when lipid content reaches more than 30% of dry weight, then stopping culturing to obtain microalgae culture solution; (ii) adding 2-100 mg/l guanidine chitosan to the microalgae culture solution, stirring at a speed of 200-400 rotations/minute (rpm) for 5-10 minutes, allowing to stand for 10-120 minutes, discarding the supernatant, and collecting the microalgae; (iii) drying the microalgae extract, crushing, according to ratio of 1 g:5 ml, adding mixed solvent to the crushed microalgae cells, stirring at the speed of 200-400 rpm for 20-40 minutes, centrifuging to obtain solution-containing algae oil and alginate precipitate, distilling the solution-containing algae oil to obtain algae oil, and extracting with a mixed solvent of chloroform and methanol according to volume ratio is 2:1; (iv) preparing immobilized full cell catalyst by (a) taking 0.0.5-1.5 wt.% (dry weight) Pseudomonas mendocina, 88.5-93.5 wt.% lysogeny broth (LB) solution culture medium, and 5-10 wt.% polyurethane foam granule, and (b) inoculating P. mendocina as lipase-producing bacteria into the LB solution culture medium, then adding polyurethane foam granule, culturing at constant temperature of 30 degrees C-35 degrees C under shaking condition and speed of 100-200 rpm for 2-5 days, filtering to obtain immobilized P. mendocina strain of polyurethane foam granule, using water for washing, drying, adding 0.1-0.3 wt.% glutaraldehyde aqueous solution having concentration of 50-100 mg/l, uniformly mixing, filtering, adding the filter residue with phosphoric acid buffer solution with 6.5 pH, oscillating under speed of 100-200 rpm for 5-10 minutes, filtering, washing with water, and drying to obtain immobilized full cell catalyst; (v) mixing the algae oil and methanol according to mol ratio of 1:1-1.5 to obtain a mixed solution, adding the mixed solution with 1-10 wt.% immobilized full cell catalyst, under 100-200 rpm oscillation condition, carrying out catalytic transesterification reaction at 25-35 degrees C, adding the mixed solution with same amount of methanol for every 20-30 hours, where total adding times is 3-5 times, and continuing to oscillate under speed of 100-200 rpm for 20-30 hours to obtain biofuel; and (vi) drying the alginate precipitate obtained in the step (iii), carrying out pyrolysis through biomass pyrolysis device at 400-600 degrees C, controlling pressure at 0.1-0.2 Mpa under feeding rate of 0.4-0.7 kg/hour to obtain vehicle biofuel, and algae residue used as fertilizer.