The invention relates to a mesoporous solid acid material, in particular to an aluminum-doped PHTS (plugged hexagonal template silica) mesoporous material with a hexagonal meso-structure, wherein the specific surface area of the mesoporous material is 400cm<2>/g to 1,200cm<2>/g; the pore volume is 0.4cm<3>/g to 1.1cm<3>/g; and the pore diameter is 4nm to 18nm. The aluminum-doped PHTS mesoporous material of the invention is prepared through direct hydrothermal synthesis to which methylbenzene combined with the aluminum-doped process is introduced. The mesoporous material is applicable in tetrahydrofuran polymerization, wherein the relative molecular weight of the polymerization product is 1,500 to 2,200; the molecular weight distribution is 1.7 to 2.3; and the mesoporous material has the advantages of moderate acidity, high activity and good stability; and the mesoporous material is also applicable as a catalytic material for cracking, esterification, alkylation and other catalytic reaction.