The invention relates to a high-boron iron-based wear-resistant surfacing flux-cored welding wire. The welding wire is composed of a low-carbon steel sheath and core powder, and is characterized in that the iron element in the low-carbon steel sheath and the core powder, and the iron element in the core powder Elements include boron, carbon, manganese, and silicon. The weight percentage of boron, carbon, manganese, and silicon in the core powder is: boron 6-12%, carbon 0.1-3%, manganese 0.6-2%, silicon 0.3-1.5%, the balance is iron. It may also include 0.3-3.5% of Ti, 0.6-2% of Mn, 0.3-1.5% of Si, 0-1% of molybdenum, 0-1% of K / Na modifier, and 0-1.5% of aluminum-magnesium alloy. The high-boron iron-based wear-resistant surfacing flux-cored welding wire of the present invention mainly relies on boron, titanium, carbon and other alloy elements to form borides and a small amount of carbides to realize the wear resistance of the surfacing alloy, and by adding rare earth, nickel, Aluminum-magnesium alloys, etc. improve the comprehensive performance of surfacing alloys.