Hierarchical　pores　and　oxygen　vacancies　play　a　vital　role　in　enhancing　the　adsorption　behavior　of　metal-organic　frameworks　(MOFs).　Herein,　a　hierarchical　Ti-MOF　with　oxygen　vacancies　was　synthesized　via　a　temperature-regulated　linker　defect　engineering　strategy　for　the　first　time.　The　materials　were　characterized　by　XRD,　FTIR,　TGA,　XPS,　SEM,　TEM,　EPR,　and　BET　analyses.　The　incorporation　of　hierarchical　pores　and　oxygen　vacancies　facilitates　diffusion　of　guest　molecules　and　endows　the　surface　of　the　material　with　electronegativity,　resulting　in　efficient　adsorption　performance　for　methylene　blue　(MB)　dye　over　a　wide　pH　range.　Isotherm　studies　indicate　that　the　adsorption　process　follows　a　Langmuir　isotherm　model,　and　the　maximum　adsorption　capacity　was　525.7　mg　g−1.　Kinetic　studies　indicate　that　the　adsorption　process　follows　a　pseudo-second-order　kinetic　model,　and　the　adsorption　equilibrium　time　was　only　10　min.　The　ultra-large　adsorption　capacity　and　ultra-low　adsorption　equilibrium　time　originated　from　the　hierarchical　pores　and　oxygen　vacancies,　exceeding　the　performance　of　most　reported　MOFs.　Thermodynamic　studies　reveal　that　adsorption　processes　are　spontaneous　and　endothermic　in　nature.　The　adsorption　mechanism　can　be　attributed　to　electrostatic　attraction,　π-π　stacking,　hydrogen　bonding,　n-π*　interactions,　and　pore　filling.　Reusability　studies　and　continuous　operation　on　a　fixed　bed　both　exhibited　its　potential　for　practical　applications.　This　research　provides　valuable　insights　into　the　synthesis　of　novel　adsorbents　with　an　ultra-large　adsorption　capacity　and　ultra-high　adsorption　rate　in　the　full　pH　range,　and　broadens　their　potential　application　in　the　continuous　removal　of　cationic　dyes　from　wastewater.　©　2025　The　Royal　Society　of　Chemistry.