Silver brazing powder FB125, white powder, with strong activity and good soldering fluidity. It can remove fluoride effectively, improve brazing flux's wettability on base materials and permeability, and ensure compact brazing connectors and joints and few residues after soldering together with silver base brazing flux brazing copper, copper alloy, steel, carbon steel and high-temperature alloy at 570~870℃. It adopts torch and induction soldering methods.