A　visible-waveband　extra　high　power　supercontinuum　(SC)　all-fiber　laser　is　demonstrated.　The　laser　structure　includes　a　seed　laser,　master　power　amplifier,　and　the　SC　generation　system,　which　usually　adopts　photonic　crystal　fiber　(PCF)　with　small　mode　area　as　the　nonlinear　(NL)　medium.　A　repetition　frequency　multiplier　is　utilized　in　the　seed　laser　to　adjust　the　pulse　peak　power　and　suppress　the　NL　effects　in　the　amplification　process.　Additionally,　a　homemade　all-fiber　high　power　mode　field　adaptor,　which　is　used　to　couple　the　pump　pulses　into　the　small　mode　area　PCF,　works　successfully　at　the　incident　pulse　power　of　120　W　with　high　coupling　efficiency　of　83%.　Eventually,　53.3　W　visible-waveband　extra　high　power　SC　fiber　laser　is　obtained　with　spectrum　ranging　from　430　to　2400　nm　and　spectral　width　below　10　dB　flatness　exceeding　1700　nm　(except　pump　wavelength).　In　addition,　the　visible-waveband　power　(below　850　nm)　takes　up　about　22%　of　the　total　SC　power.　To　the　best　of　our　knowledge,　this　is　the　highest　average　power　of　visible-waveband　extra　SC　source　ever　reported　in　such　broad　spectrum　range　and　high　spectrum　flatness.