NOVELTY - A hollow porous spherical platinum-silver alloy nano material has a spherical structure with a porous shell and an inner core. The diameter of spherical structure is 5-500 nm. The inner diameter of core is 1-400 nm. The pore wall thickness is 1-50 nm. The pore size of porous shell is 1-20 nm.    USE - Hollow porous spherical platinum-silver alloy nano material used for chemical and electrochemical catalyst, chemical sensor, biomolecular sensor, information storage medium, fuel cell, solar cell, and slow release and targeting medicine feeding treatment.    ADVANTAGE - The hollow porous spherical platinum-silver alloy nano material is easily and economically manufactured.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of hollow porous spherical platinum-silver alloy nano material, which involves mixing polyhydric alcohol, surfactant (0.01-5 mol/l), halogen ion-containing inorganic salt (0.001-1 mmol/l) and copper-containing inorganic salt (0.001-1 mmol/l), stirring or ultrasonically dissolving to obtain mixed solution (A), adding an inorganic silver salt precursor (0.01-5 mol/l) into the mixed solution (A), stirring or oscillating and dissolving to obtain mixed solution (B), adding an inorganic platinum salt precursor (0.005-2 mol/l) into the mixed solution (B), quickly stirring and uniformly dissolving to obtain mixed solution (C), transferring prepared mixed solution (C) into a high temperature and high pressure reaction kettle, sealing the reaction kettle, placing into constant temperature furnace, maintaining at 150-600 degrees C for 50-1000 minutes, stopping heating, transferring grey black mixed solution into a centrifugal tube from the reaction kettle, washing with ethanol and water, centrifuging and separating to obtain platinum-silver alloy nanoparticles, re-dispersing the platinum-silver alloy nanoparticle into polyvinylpyrrolidone solution to prepare platinum-silver alloy nanoparticle dispersion with concentration of 0.001-1 mol/l, adding concentrated nitric acid into the mixed dispersion, reacting for 10-360 minutes, cleaning with water and centrifuging to obtain sediment, which is hollow porous spherical platinum-silver alloy nano material with surface micropores, re-dispersing the centrifuged sediment into water, putting into high pressure reaction kettle, annealing at 100-500 degrees C for 30-360 minutes and cleaning with water and centrifuging.