The invention discloses trichoderma hamatum capable of preparing nano silver by reducing and relates to trichoderma hamatum. The invention provides the trichoderma hamatum which can be used for preparing nano sliver by reducing and providing a novel bacterial source for preparing nano sliver by reducing. The trichoderma hamatum is trichoderma hamatum NYNJ03 which is preserved in China General Microbiological Culture Collection Center, in No.3, institution I, Beichen Road, Changyang District, Beijing, on July 3, 2014, with a preservation number of CGMCC No: 9333. The trichoderma hamatum NYNJ03 disclosed by the invention can be used for preparing nano sliver by reducing, and providing the novel bacterial source for preparing nano sliver by reducing, and is used for preparing nano sliver.