A　mechanically-tunable　random　laser　based　on　a　waveguide-plasmonic　scheme　has　been　investigated.　This　laser　can　be　constructed　by　spin　coating　a　solution　of　polydimethylsiloxane　doped　with　the　rhodamine　6G　organic　dye　and　silver　nanowires　onto　a　silicone　rubber　slab.　The　excellent　overlap　of　the　plasmon　resonance　peak　of　the　silver　nanowires　with　both　the　pump　wavelength　and　the　photoluminescence　spectrum　provides　the　low　threshold　and　tuning　properties　of　the　random　laser.　The　random　laser　wavelength　can　be　tuned　from　558　to　565　nm　by　stretching　the　soft　substrate,　which　causes　reorientation　and　breakage　of　the　silver　nanowires.　The　polarization　state　of　the　random　laser　can　also　be　changed　from　random　polarization　to　partial　polarization　by　stretching.　The　laser　performance　remains　unchanged　after　the　stretching　and　restoration　experiments.　These　results　not　only　enable　easy　realization　of　an　ultrathin　flexible　plasmonic　random　laser　but　also　provide　insights　into　the　mechanisms　of　three-dimensional　plasmonic　feedback　random　lasers.