Transition　metal　oxides　have　attracted　much　attention　in　supercapacitors(SCs)　research　field　due　to　their　eco-friendly　characteristics　and　high　theoretical　specific　capacity.　However,　the　slow　reaction　kinetics　process　and　poor　long-cycle　performance　hinder　its　potential　application.　To　overcome　these　shortcomings,　MnCo2O4　micro-flowers　(MnCo2O4-MF)　with　hierarchical　structure　were　prepared.　The　spinel　MnCo2O4　has　a　variety　of　metal　valence　states,　which　can　provide　more　electrochemical　active　sites　compared　to　mono-metal　oxides.　Moreover,　the　unique　hierarchical　structure　of　MnCo2O4-MF　shortens　the　transmission　distance　of　ions　and　electrons,　and　reduce　the　volume　expansion　and　structural　collapse　during　the　cycles.　Benefiting　from　the　crystal　phase　and　structure　advantages　of　MnCo2O4-MF,　the　reaction　kinetics　process　was　accelerated　and　it　showed　excellent　long-cycle　stability.　In　aqueous　alkaline　electrolyte,　MnCo2O4-MF　exhibits　an　ultra-high　specific　capacity　of　1230　F　g−1　at　a　current　density　of　1　A　g−1.　Even　after　10,000　cycles　at　10　A　g−1,　the　capacity　of　102.67%　is　still　maintained.　In　addition,　we　constructed　the　sandwich　structured　flexible　flexible　hybrid　solid　supercapacitor　(FHSC)　based　on　MnCo2O4-MF　//　carbon　nanoboxes.　The　FHSC　devices　not　only　expand　the　working　voltage　window　of　SCs,　but　also　show　flexibility　and　excellent　electrochemical　performance.　©　2022