The preparation process of nanometer silver gel with high stability features that one kind of high-valent small molecule and silver nitrate solution are complexed, pH regulated and with reductant solution at room temperature to produce nanometer silver gel. The process has simple technological process, low cost, high gel purity, high gel stability, small granularity and homogeneous grain size distribution among other advantages. Altering the technological conditions can produce nanometer silver gel of different grain sizes within 3-50 nm, and the nanometer silver gel may be used widely in electronic, catalytic, medicine, paint, fabric and other fields.