NOVELTY - A spiral groove composite biofiller is prepared by crushing coconut shell, ultrafine grinding into pulverizer, refining to obtain coconut shell powder having particle size of 200 meshes, grinding 100 mass parts vermiculite into pulverizer, sieving to obtain vermiculite powder having particle size of 200 meshes, heating into muffle furnace at 300 degrees C having heating speed of 10 degrees C/minute, naturally cooling to room temperature, soaking with 50 mass parts 2-pyrrolidone-5-carboxylate for 5 hours to form solid-liquid mixture, and adding with anhydrous ethanol.    USE - Preparation of spiral groove composite biofiller for removal of pollutant.    ADVANTAGE - Process is environment-friendly, product improves removal of pollutant and has better hanging membrane character, good adsorbability and dispersibility, stability, excellent microbial biofilm property, and increased specific surface area, and raw material is abundant and has low price.    DETAILED DESCRIPTION - A spiral groove composite biofiller is prepared by crushing coconut shell, ultrafine grinding into pulverizer, refining to obtain coconut shell powder having particle size of 200 meshes, grinding 100 mass parts vermiculite into pulverizer, sieving to obtain vermiculite powder having particle size of 200 meshes, heating into muffle furnace at 300 degrees C having heating speed of 10 degrees C/minute, naturally cooling to room temperature, soaking with 50 mass parts 2-pyrrolidone-5-carboxylate for 5 hours to form solid-liquid mixture, adding with anhydrous ethanol, dropping 5 mass parts of 1 M silver nitrate solution into solid-liquid mixture at less than or equal to 30 degrees C under stirring condition, standing for 2 hours, centrifuging to remove solid substance, washing with anhydrous ethanol for 3-5 times, drying solid substance at 80 degrees C to obtain carboxyhydroxylated-silver-modified vermiculite powder having particle size of less than or equal to 200 meshes, mixing activated carbon powder, granular activated carbon, and zeolite powder having mass ratio of 0.5:0.5:1 to obtain mixed powder, adding 10 mass parts obtained coconut shell powder, 100 mass parts obtained carboxyhydroxylated-silver-modified vermiculite powder, and 15 mass parts obtained mixed powder, mixing, adding 50 mass parts water, uniformly stirring, shaping to obtain filler carrier, press forming into mold to obtain spiral groove spherical filler carrier, calcining at 600-800 degrees C for less than or equal to 10 hours, cooling to room temperature for 2-4 hours, screening Paracoccus denitrificans, Bacillus, beer yeast, and Bacillus cereus with culture medium from water body or sludge, accessing P. denitrificans, Bacillus, beer yeast, and B. cereus to beef extract peptone liquid culture medium, culturing at 36 degrees C for 24 hours, centrifuging at 5000 rpm for 10 minutes to obtain solid precipitate, re-suspending with saline for 3 times to obtain P. denitrificans bacterial suspension, Bacillus bacterial suspension, beer yeast bacterial suspension, and B. cereus bacterial suspension having volume ratio of 1:2:1:2, mixing to obtain microbial flora, inoculating with 9 wt.% culture medium to obtain mixed bacterial suspension, diluting obtained mixed bacterial suspension with water into container, neutralizing pH, adding with polyvinyl alcohol mixture, uniformly coating into obtained spiral groove spherical filler carrier, applying with 0.5 mass% sodium alginate solution, washing with water for 2-4 hours, and drying at less than or equal to 40 degrees C for 20 hours.