Exploring new strategy towards efficient solid acids is significant for acid reactions. In this work, sulfonic group tethered mesoporous ionic copolymer Poly(DVB-VMPS), a kind of mesoporous poly(ionic liquid), was directly synthesized through the free radical copolymerization of sulfonic ionic liquid (IL) monomer (1-vinyl-3-propane sulfonate imidazolium) and divinylbenzene (DVB). Poly(DVB-VMPS) was used as an efficient polycation for pairing heteropolyacid (HPA) to fabricate HPA-based solid acid through solidification process. The obtained 12-tungstophosphoric acid (H3PW) derived hybrid Poly(DVB-VMPS)PW acted as a robust solid acid in the acid-catalyzed hydrolysis deoximation reaction. High yield, stable reusability and well substrate compatibility were achieved, rendering a remarkable heterogeneous recyclable catalyst for this reaction. Compared with previous post-sulfonate analogue, Poly(DVB-VMPS) PW exhibited not only improved activity but also enhanced stability, reflecting the specialty and advantage of this direct synthesis route. (C) 2016 Elsevier B.V. All rights reserved.