NOVELTY - Preparation of macroporous poly-p-phenylene material involves stirring catalyst aluminum chloride, oxidizing agent copper chloride and benzene monomer, slowly heating, changing color from colorless to brown, continuously reacting and terminating reaction; cooling reaction product, filtering, washing with hydrochloric acid, boiling with deionized water, filtering and vacuum-drying to obtain poly-p-phenylene powder; dissolving polyethylene glycol in deionized water, adding nanocarbon and poly-p-phenylene powder, uniformly stirring and spray-drying to obtain precursor; and sintering and cooling.    USE - Method for preparing macroporous poly-p-phenylene material used for preparing supported lithium borohydride/aluminum fluoride composite material (claimed) for hydrogen source of fuel cell supply, electric vehicle, electric product and military equipment.    ADVANTAGE - The material increases hydrogen absorbing and releasing dynamics property.    DETAILED DESCRIPTION - Preparation of macroporous poly-p-phenylene material comprises:    (A) stirring 20.0 g catalyst aluminum chloride, 10.1 g oxidizing agent copper chloride and 53.2 mL benzene monomer, slowly heating to 40 degrees C, changing color from colorless to brown, continuously reacting for 1 hour and terminating reaction;    (B) cooling reaction product, filtering, washing with 18% hydrochloric acid, boiling with deionized water for 1 hour, filtering and vacuum-drying at 100 degrees C for 6 hours to obtain poly-p-phenylene powder;    (C) dissolving 1 g polyethylene glycol with molecular weight of 10000 in 50 mL deionized water, adding 2 g nanocarbon and 2 g poly-p-phenylene powder, uniformly stirring for 30 minutes and spray-drying to obtain precursor; and    (D) sintering precursor at 400-700 degrees C under nitrogen atmosphere for 2 hours, cooling to room temperature, adding 100 mL of 18 wt.% hydrochloric acid, standing for 2 hours, boiling for 2 hours, filtering, adding 100 mL of 1 wt.% lithium hydroxide and 100 mL deionized water, processing for 1 hour, and drying at 100 degrees C for 6 hours.    An INDEPENDENT CLAIM is included for preparation of supported lithium borohydride/aluminum fluoride composite material comprising:    (A) ball-milling aluminum fluoride at speed of 1000 revolutions/minute for 10 hours to obtain aluminum fluoride powder with granularity of 10-50 mu m;    (B) dissolving 1 g polyethylene glycol with molecular weight of 10000 in 50 mL deionized water, adding 1 g calcium carbonate, 1 g aluminum fluoride powder and 2 g poly-p-phenylene powder, uniformly stirring for 30 minutes and spray-drying to obtain precursor;    (C) sintering precursor at 400-700 degrees C for 2 hours, cooling to room temperature, adding 100 mL of 18 wt.% hydrochloric acid, standing for 2 hours, boiling for 2 hours, filtering, adding 100 mL of 1 wt.% lithium hydroxide and 100 mL deionized water, processing for 1 hour and vacuum-drying at 100 degrees C for 6 hours to obtain supported aluminum fluoride material; and    (D) adding 0.84 g lithium borohydride to 28 mL tetrahydrofuran, adding 1 g supported aluminum fluoride material, ultrasonically stirring for 30 minutes and evaporating tetrahydrofuran solvent.