The present invention relates to a method of manufacturing magnetic silver nanoparticles, comprising refluxing iron chloride and oleic acid to produce Fe oleate, a step of heat-treating Fe oleate and 1-octadecene in a nitrogen state to prepare magnetic nanoparticles, Palmitic Acid and It characterized in that it comprises the step of obtaining Ag(I) Palmitate as a product by synthesizing AgNO3, and obtaining magnetic silver nanoparticles by synthesizing Ag(I) Palmitate and Fe3O4 magnetic NPs.본 발명은 자성 은나노입자의 제조방법에 관한 것으로써 염화철과 올레산을 환류시켜 생성물인 Fe oleate를 생성하는 단계, Fe oleate와 1-octadecene을 질소 상태에서 열처리하여 magnetic nanoparticles를 제조하는 단계, Palmitic Acid와 AgNO3를 합성하여 생성물로 Ag(I) Palmitate를 얻는 단계, Ag(I) Palmitate 와 Fe3O4 magnetic NPs를 합성하여 자성 은나노입자를 얻는 단계를 포함하는 것을 특징으로 한다.