SnO　based　material　is　one　of　the　most　promising　anode　materials　for　lithium-ion　batteries　owing　to　its　high　theoretical　capacity.　However,　the　difficult　synthesis　process,　large　volume　expansion　and　rapid　capacity　decay,　etc.,　limited　its　further　application.　Herein,　graphene　encapsulated　SnO　nanospheres,　self-assembled　from　numerous　nano-sized　secondary　nanoparticles,　have　been　successfully　synthesized　through　an　efficient　one-pot　solvothermal　method　within　three　hours.　The　graphene　encapsulation　and　secondary　particle　assembly　structure　effectively　improves　the　conductivity　of　SnO,　shortens　the　ion　transmission　path　and　reduces　its　volume　expansion　during　cycling,　thus　achieving　cycle　stability.　SnO/G-3　H　composite　delivers　a　discharge　capacity　of　1307　mA　h　g-1　after　700　cycles　at　800　mA　g-1,　and　maintained　an　enhanced　rate　capability　of　423　mA　h　g-1　at　3000　mA　g-1.　This　simple,　economic,　and　environmental-friendly　synthesis　route　can　be　extended　to　the　preparation　of　other　transition　metal　oxide　materials.