This　study　proposes　an　innovative　prefabricated　double　L-shaped　beam-column　joint　with　triangular　stiffener　(double　L-shaped　joint)　for　low-rise　residential　buildings.　The　double　L-shaped　joint　consists　of　the　L-shaped　connector　with　triangular　stiffener,　web　side　plate　connection,　Hshaped　beam,　and　concrete-filled　lightweight　steel　tube　(CFLST)　column　or　square　hollow　steel　tube　(SHS)　column.　Twelve　double　L-shaped　joints　are　manufactured　and　experimented.　The　design　parameters　include　the　column　types　(CFLST　or　SHS),　triangular　stiffener　height,　perforated　end　plate　(with　or　without),　and　the　web　side　plate　connection　(with　or　without).　In　addition,　the　failure　modes,　hysteretic　performances,　ultimate　capacity,　stiffness　degradation,　deformation　capacity,　energy　dissipation,　and　strain　responses　of　joint　specimens　are　analyzed.　The　experimental　results　show　that　the　failure　modes　include　steel　tube　local　buckling,　weld　cracking,　and　bolts　fracture　in　the　area　of　the　L-shaped　connector.　The　ultimate　moment　of　the　CFLST　column　joints　rises　from　4.53%　to　13.05%　compared　to　the　SHS　column　joints,　while　the　initial　stiffness　increases　from　2.16%　to　26.46%.　The　perforated　end　plate　grows　at　the　ultimate　moment,　but　the　ductility　index　reduces.　The　initial　stiffness　and　deformation　capacity　of　the　specimens　without　a　web　side　plate　connection　decreases　significantly.　The　finite　element　model　is　developed,　and　the　numerical　simulation　is　conducted.　The　experimental　results　are　consistent　with　failure　modes　and　bending　moment　versus　rotation　angle　curves　obtioned　by　numerical　simulation.