NOVELTY - A method of preparation of porous adsorbent for absorption of biodegradable petroleum chemical from waste water, involves: preparing adsorbent using ammonium bicarbonate, ammonium dihydrogen phosphate, calcium nitrate ammonium hydroxide, hydrochloric acid, ammonium chloride, ethylenediamine acetic acid calcium potassium, styrene chloroform, ethylene benzene chloroform, azobisisobutyronitrile chloroform and polyethylene alcohol; and culturing the adsorbent in petroleum hydrocarbon biodegradation bacterium for 24 hours.    USE - In preparing porous adsorbent for absorption of biodegradable petroleum chemical from waste water (claimed).    ADVANTAGE - The manufacturing method is simple, provides porous adsorbent having slow release function.    DETAILED DESCRIPTION - A method of preparation of porous adsorbent for absorption of biodegradable petroleum chemical from waste water, involves: (1) mixing 100 mL concentration of 0.35 mol/L NH4HCO3 solution, and 100 mL concentration of 0.62mol/L NH4H2PO4 solution, to obtain a mix liquid (A1), adding 0.01 mol/L of NH4OH solution, and 0.01 mol/L of hydrochloric acid solution to adjust pH of 9, to obtain a mixed solution (A); (2) dropwise addition of 300 mL concentration of 0.025 mol/L of Ca (NO3)2 solution in the mixed solution (A) with stirring to obtain a mixed solution (B); (3) dropwise addition of concentrated HNO3 in the mixed solution (B) to obtain a mixed solution (C); (4) adding concentrated 0.01 mol/L NaOH solution in the mixed solution (C), followed by adding 0.01 mol/L of hydrochloric acid solution to adjust pH of 3.5, to obtain a mixed solution (D); (5) adding 100 mL concentration of 1.1 mol/L NH4Cl aqueous solution to the mixed solution (D), to obtain a mixed solution (E); (6) adding 50 mL concentration of 0.15 mol/L ethylenediamine acetic acid calcium potassium solution, in the mixed solution (E) to obtain a mixed solution (F); (7) adding 200 mL mass fraction of 11.5% chloroform solution of styrene, 40 mL mass fraction of 9.5% of ethylene benzene chloroform solution and 40 mL mass fraction of 1.5% of azobisisobutyronitrile chloroform solution in the mixed solution (F) to obtain a mixed solution (M); (8) dropwise addition of 70 ml of the mixed solution (F) in the mixed solution (M) and stirring at speed of 1000 revolution per minute (r/min) for 8 minutes to obtain a mixed solution (O); (9) dropwise addition of 210 mL mass fraction of 5.5% of polyethylene alcohol solution in 420 ml of the mixed solution (O) and stirring at speed of 1000 r/min for 8 minutes to obtain a mixed solution (P); (10) adding 1380 mL mass fraction of 0.7% polyethylene alcohol solution in the mixed solution (P) and stirring at speed of 1000 r/min for 7-8 hours and then carrying out centrifugal separation at rotating speed of 6000 r/min, then washing 3 times using deionized water, freezing and drying to adsorbent having slow release function; (11) culturing the adsorbent in a petroleum hydrocarbon biodegradation bacterium for 24 hours, to fixed the absorbing bacterium on a sorbent; where the petroleum hydrocarbon biodegradation bacterium culture liquid comprises: 5x 101 colony-forming units (CFU)/ml bacteria, where the culture liquid comprises 2 g of NH4HCO3, 10.5 g of NaCl, 2.5 g KH2PO4, 0.1 g of FeCl3, 3.5 g of NgSO4, 0.15 g of CaCl2.2H2O; and (12) drying the adsorbent.