Li7P3S11 (LPS) solid electrolyte (SE) can be used as a coating layer for Si anode as the next generation high energy storage anode material for lithium ion battery (LIB). In this paper, a thin LPS SE was designed to coat on the Si nanoparticles surface to form a core-shell structure by a facile liquid-phase in-situ reaction method. The LPS shell can address the volume expansion of silicon anode successfully during lithiation and delithiation processes. Moreover, it leads to enhancement of the electrochemical performance for Si anode with excellent cycling stability and rate ability. The LPS SE coating is expected to be a promising strategy for other lithium-ion batteries anodes.