Considering　the　non-rigid　transmission　connection　between　the　wind　turbine　and　the　generator,　their　angular　velocity　is　inconsistent.　A　DC-link　voltage　control　model　with　uncertainties　is　established　by　a　two-mass　inertial　model.　The　system　uncertainties　increase　greatly　compared　with　the　single-mass　inertial　model,　which　aggravates　a　DC-link　voltage　accuracy.　To　suppress　the　uncertainties,　the　complementary　sliding　mode　control　(CSMC)　is　proposed　to　regulate　the　DC-link　voltage　since　it　has　strong　robustness.　The　equivalent　controller　for　the　voltage　loop　is　obtained　by　the　conservation　principle　of　AC　and　DC　side　power,　and　the　compensation　controller　for　the　uncertainties　is　designed　by　the　saturation　function.　The　CSMC　system　is　analyzed　to　be　asymptotic　stability.　The　simulation　and　experiment　results　show　that　the　CSMC　system　can　suppress　the　system　uncertainties,　and　obtain　a　more　little　steady-state　error　of　the　DC-link　voltage,　compared　with　PI　control　system.