In　this　work,　a　1550-nm　full-fiber　Doppler　lidar　via　software-defined　platform　is　built　to　realize　flexible　and　low-cost　contactless　vibration　measurement　of　high-voltage　power　equipment.　A　1550-nm　fiber　layout　is　designed　to　generate　optical　interference　between　vibration　signal　and　carrier　wave.　The　reflected　vibration　signal　is　collected　by　an　optical　transceiver　and　the　carrier　wave　is　generated　by　an　acousto-optic　modulator　(AOM).　The　optical　beat　signal　is　collected　by　a　balanced　detector　(BD)　then　sent　into　a　general　software　defined　radio　(SDR)　receiver.　By　GNU　developing　platform,　the　target　mechanical　vibration　signal　is　demodulated　and　several　flexible　functions　such　as　speed-acceleration　trans,　harmonic　component　analysis　and　fault　diagnosis　is　realized.　Performance　of　Doppler　lidar　is　first　verified　on　mechanical　vibration　source　by　PZT　vibration　actuator,　results　show　that　the　designed　lidar　could　retrieve　50　Hz-20　kHz　mechanical　vibration　signals　within　the　working　distance　is　up　to　20　m.　Further　case　application　scenarios　on　the　power　transformer　and　gas-insulated　switchgear　(GIS)　are　also　conducted　to　verify　the　feasibility　of　proposed　lidar.