A series of novel nanosheet catalysts with Ru-core@Pt-shell were synthesized. An average 1.5–4.5ML Pt shell was deposited on 1ML Ru nanosheet. The average thickness of Ru@Pt nanosheet is between 0.3 and 2.7 nm. Nanosheet electrocatalyst shows 4.5 times higher O2 reduction reaction activity. H2 oxidation activity and durability of nanosheet catalyst were higher than PtRu/C.