▎ 摘　　要

NOVELTY - A photothermal/photoacoustic/bacteriostatic multifunctional nanosilver ball is prepared by dissolving citric acid and urea in ultra-purified water, heating at 150-170 degrees C for 12-16 hours, cooling, purifying to obtain nitrogen-doped graphene quantum dot, mixing silver source with obtained nitrogen-doped graphene quantum dot, irradiating for 2-4 hours using UV light, and cleaning excess nitrogen-doped graphene quantum dots to obtain nanosilver ball cluster. USE - The method is for preparing photo-thermal/photoacoustic/bacteriostatic multifunctional nanosilver ball for synthesizing nano-probe for multifunctional diagnosis and treatment. ADVANTAGE - The method is simple and has little by-products.