NOVELTY - A sulfurated polyacetylene anode active material is prepared by (A) taking hydrogen-containing polyethylene halide as raw material, reacting with alkali for 1-10 hours at 15-30 degrees C in organic solvent for removing hydrogen halide, and obtaining polyacetylene; and (B) mixing polyacetylene with sulfur at ratio of 1:1-10, and heating for 0.5-10 hours at 50-400 degrees C in the presence of argon to obtain sulfurated polyacetylene.    USE - Method for preparing sulfurated polyacetylene anode active material for secondary aluminum battery for mobile power supply. Uses include but are not limited to mobile phone, notebook computer, portable electronic device, electric motor car and hybrid electric vehicle.    ADVANTAGE - The battery has higher reversible capacity, better cycle performance, wide material availability, simple method, low cost, high purity and no environmental pollution.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a secondary aluminum battery comprising aluminum sheet, aluminum powder and aluminum alloy as cathode active material, and sulfurated polyacetylene as anode active material; and organic or inorganic electrolyte solution or polymer electrolyte or solid electrolyte, membrane, current collector, battery housing and lead wire; and    (2) a method for preparing the secondary aluminum battery which comprises preparing the anode, and preparing the battery.    The preparation of anode involves adding conductor and adhesive to anode active material at ratio of 6-8:1-3:0.5-1.5, where anode active material is prepared from polyacetylene and sulfurated polyacetylene; putting into solvent at ratio of 1:1 with anode active material, stirring continuously to mix uniformly to form into paste or slurry to obtain anode active material slurry; and coating on current collecting sheet, vacuum drying until solvent is volatilized and rolling into electrode sheet which is 0.2-0.4 mm thick, 35-45 mm wide and 140-160 mm long. The preparation of secondary aluminum battery involves winding anode sheet and 0.10-0.20 mm thick cathode sheet made of glass fiber non-woven membrane, aluminum sheet, aluminum powder and aluminum alloy to form core to put into nickel plated steel housing; and adding to organic electrolyte and sealing to form cylindrical secondary aluminum battery or AA cylindrical secondary aluminum battery. The conductor is Super-P (RTM: conductive carbon black), conductive carbon black, acetylene black and graphite black. The adhesive is polyvinylidene fluoride, polycyclovinyl fluoride, PTFE, sodium carboxymethylcellulose and ethylene propylene rubber. The solvent is water, ethanol, acetonitrile and N-methyl pyrrolidone. The current collector or current collecting sheet is foaming nickel, stainless steel net, carbon fiber cloth, copper net, copper foil and aluminum foil. The organic electrolyte or electrolyte solution is organic electrolyte with aluminum salt and ionic liquid with aluminum ion.