The　sphene-type　solid　electrolyte　with　high　ionic　conductivity　has　been　designed　for　solid-state　lithium　metal　battery.　However,　the　practical　applications　of　solid　electrolytes　are　still　suffered　by　the　low　relative　density　and　long　sintering　time　of　tens　of　hours　with　large　energy　consumption.　Here,　we　introduced　the　spark　plasma　sintering　technology　for　fabricating　the　sphene-type　Li1.125Ta0.875Zr0.125SiO5　solid　electrolyte.　The　dense　electrolyte　pellet　with　high　relative　density　of　ca.　97.4%　and　ionic　conductivity　of　ca.　1.44x　10(-5)　S/cm　at　30　degrees　C　can　be　obtained　by　spark　plasma　sintering　process　within　the　extremely　short　time　of　only　ca.　0.1　h.　Also　the　solid　electrolyte　provides　stable　electrochemical　window　of　ca.　6.0　V(vs.　Li+/Li)　and　high　electrochemical　interface　stability　toward　Li　metal　anode.　With　the　enhanced　interfacial　contacts　between　electrodes　and　electrolyte　pellet　by　the　in-situ　formed　polymer　electrolyte,　the　solid-state　lithium　metal　battery　with　LiFePO4　cathode　can　deliver　the　initial　discharge　capacity　of　ca.　154　mAh/g　at　0.1　C　and　the　reversible　capacity　of　ca.　132　mAh/g　after　70　cycles　with　high　Coulombic　efficiency　of　99.5%　at　55　degrees　C.　Therefore,　this　study　demonstrates　a　rapid　and　energy　efficient　sintering　strategy　for　fabricating　the　solid　electrolyte　with　dense　structure　and　high　ionic　conductivity　that　can　be　practically　applied　in　solid-state　lithium　metal　batteries　with　high　energy　densities　and　safeties.