NOVELTY - A silsesquioxane complex catalyst is prepared by breaking silsesquioxane silicon-oxygen bond using strong acid as catalyst in which molar ratio strong acid:polyhedral oligomeric silsesquioxane (POSS) is 3-6, performing incomplete condensation to obtain trihydroxy POSS trisilanol, dissolving in benzene or tetrahydrofuran to obtain solution A, dissolving metal halide quat.-ammonium salt in benzene solvent to obtain transition metal salt solution i.e. solution B, adding solution A to catalyst i.e. diethylamine with amount of 1-2 times of moles of catalyst, and stirring for 12 hours.    USE - Preparation of silsesquioxane complex catalyst with prevention of metal species aggregation for direct formic acid fuel cell anode oxidation catalyst (claimed).    ADVANTAGE - Preparation method is simple, efficient, and environment-friendly and prepared catalyst has good activity and selectivity, and long service life.    DETAILED DESCRIPTION - A silsesquioxane complex catalyst is prepared by breaking silsesquioxane silicon-oxygen bond using strong acid as catalyst in which molar ratio strong acid:polyhedral oligomeric silsesquioxane (POSS) is 3-6, performing incomplete condensation to obtain trihydroxy POSS trisilanol, dissolving in benzene or tetrahydrofuran to obtain solution A, dissolving metal halide quat.-ammonium salt in benzene solvent to obtain transition metal salt solution i.e. solution B, adding solution A to catalyst i.e. diethylamine with amount of 1-2 times of moles of catalyst, stirring for 12 hours, adding solution B with amount of 1-2.5 times of moles of solution A, stirring overnight, connecting transition metal salt to POSS to obtain POSS containing 1-5% transition metal, recrystallizing to obtain POSS complex, adding hexane to prepare 1 mol/L solution i.e. solution C, adding solution C to 5-15 wt.% of 5% perfluorosulfonic acid polymer solution, performing magnetic stirring overnight to obtain anode catalyst emulsion D, uniformly coating emulsion D on carrier electrode, and drying in vacuum in the presence of inert gas to obtain direct formic acid fuel cell anode oxidation catalyst.    DESCRIPTION OF DRAWING(S) - The drawing shows a synthesis route of preparing cobalt-polyhedral oligomeric silsesquioxane complex. (Drawing includes non-English language text).