Abstract:High-zinc and low-nickel alloy coating used for stripping layer on 35 μm ultra-thin copper foil as carrier foil was electrodeposited. Ultra-thin copper foil was electrodeposited in pyrophosphate solution, and then ultra-thin copper carrier foil was prepared. The effects of ratio of zinc sulfate and nickel sulfate, dosage of complexing agent of potassium pyrophosphate trihydrate, dosage of additives of gelatin on the properties of stripping layer were investigated. The results show that zinc and nickel can be co-electroplated under the conditions including zinc sulfate of 12 g/L, nickel sulfate of 6 g/L, potassium pyrophosphate trihydrate of 0.5 mol/L, gelatin of 0.2 g/L and sodium dodecyl benzene sulfonate 0.2~0.3 g/L. Peelable strength between ultra-thin copper foil and carrier copper foil is stable and can reach 4.7 N/cm when zinc-nickel alloy is used as a stripping layer.