Abstract: Taking fly ash as surfactant, B4C-Fe-based surfactant argon arc cladding layer was prepared on Q235 steel surface by surfactant argon arc cladding technology, and then the phases, microstructure, microhardness and wear resistance of the cladding were studied and compared with those of B4C-Fe-based argon arc cladding layer (common argon arc cladding layer). The results showed there were Fe3.5B, Fe23(C, B)6, Fe5Si3 and Fe2AlB2 new phases in the surfactant argon arc cladding layer. Fly ash played an important role in refining the microstructure of the surfactant argon arc cladding layer and promoting good adhesion of the cladding layer with the base metal.The microhardness of the surfactant argon arc cladding inreased by 60 HV than that of the common argon arc caldding layer, and the abrasive wear and erosion wear resistance of the former were 1.16 times and 1.86 times of those of the latter.