Disclosed is a tumor vessel embolizing agent, including: unmodified Au nanoparticles and a pharmaceutically acceptable medium. The use of Au nanoparticles for the manufacture of tumor embolizing agent is also provided.本發明提供一種腫瘤血管栓塞劑,包括:未經修飾之金奈米粒子;以及一藥學上可接受之介質。本發明另提供金奈米粒子在製備腫瘤血管栓塞劑的用途。