The invention discloses a cladding layer of a valve sealing surface. The 
alloy powder of the cladding layer comprises iron, 
chromium, 
nickel, 
molybdenum, 
boron, 
silicon, carbon, 
tungsten and vanadiumelements, wherein the iron is used as a main body, the content of the iron is more than 50%, the content of the 
chromium is more than 15%, the content of the 
boron is 2.0%, and the content of the 
silicon is 2.0%; the preparation technological process of the 
alloy powder comprises the steps of burdening, 
smelting, atomizing, 
drying and screening; and the cladding method of the cladding layer adoptsa 
laser cladding process, cladding 
lap joint is carried out on the valve sealing surface, and the thickness of the cladding layer is 1000-2000 microns. According to the obtained cladding layer, 
cobalt-free 
alloy with iron and 
chromium as main bodies is utilized, the 
wear resistance, the 
impact resistance, the 
corrosion resistance and the like of the sealing surface of the 
ball valve are more excellent through a specific alloy 
powder preparation process and a cladding method of the cladding layer, the quality of the valve sealing surface is improved, and the service life of the valve is prolonged.