We　demonstrate　herein　a　novel　solvent-free　technique　for　the　synthesis　of　sulfonic　acid　group-functionalized　mesoporous　organosilica,　which　was　achieved　from　the　self-assembly　of　a　block　copolymer　template　using　mercaptopropyltrimethoxysilane　(MPTS)　and　tetramethoxysilane　(TMOS)　under　melting　conditions　without　using　additional　solvents　and　subsequent　condensation　at　high　temperature　(up　to　140　degrees　C).　The　resultant　samples　were　designated　as　SMS-xs,　where　x　stands　for　molar　ratio　of　MPTS/(MPTS　+　TMOS).　SMS-xs　have　relatively　large　BET　surface　areas,　highly　cross-linked　frameworks,　and　abundant　and　uniform　mesopores　with　wormhole-like　characteristics.　Interestingly,　MPTS　could　be　used　as　the　solo　precursor　to　prepare　mesoporous　organosilica　(SMS-1.0),　which　had　controllable　acidity　and　an　ultra-high　concentration　of　sulfur　(5.51　mmol　g(-1),　the　highest　acid　density　to　date),　which　was　even　higher　than　those　of　commercial　Amberlyst　15　(4.7　mmol　g(-1)),　HS-JLU-20-0.8　(4.61　mmol　g(-1))　and　sulfonated　carbon　(CH0.30O0.33S0.16,　4.90　mmol　g(-1)).　These　structural　characteristics　give　SMS-xs　excellent　activities　and　good　reusability　in　biomass　conversions　and　fine　chemicals　synthesis,　which　are　much　better　than　various　solid　acids,　such　as　Amberlyst　15,　H-form　USY　zeolite,　and　sulfonic　acid　group-functionalized　ordered　mesoporous　silica.