Silver azide (AgN₃) is one of the environmentally primary explosives with excellent initiation performances, and it can meet the demand for the miniaturization of modern weapon equipment. In this paper, nano-silver oxide (Ag₂O) of 70 nm-90 nm was prepared by wet chemical method using polyvinylpyrrolidone (PVP) as a surfactant to synthesize nanoscale AgN₃ by in-situ synthetic strategy. The analysis results demonstrated that the nano-AgN₃ had a spherical distribution, and great initiation performance. The average velocity of the titanium (Ti) sheet impacted by AgN₃ can reach more than 2600 m/s. In addition, the CL-20 explosive can be initiated stably and reliably by the AgN₃ chip assembled in the micro-initiator. It provides a new technical route for the application of MEMS micro-initiator.