A　full-color　whispering-gallery　mode　(WGM)　laser　has　been　fabricated　by　partitioning　different　light-emitting　polymers　in　a　nested　microcavity.　Red-green-blue　WGM　lasing　with　a　high　quality　factor　above　10(4)　and　a　narrow　linewidth　of　0.025　nm　emits　from　nested　capillaries　when　excited　with　a　nanosecond　laser.　The　full-color　WGM　lasing　shows　a　low　excitation　threshold　for　the　nested　microcavities,　which　can　avoid　fluorescence　resonant　energy　transfer.　We　also　achieve　wavelength　tunable　lasing　upon　altering　the　different　polymers　in　the　nested　microcavities.　The　work　demonstrates　a　simple　method　to　fabricate　a　full-color　WGM　laser　and　its　potential　applications　in　compact　lighting　devices　and　white　laser　sources.