The invention relates to a method for preparing quartz glass and the quartz glass, relates to the field of quartz glass manufacture techniques, and mainly aims to improve the corrosion resistance of the quartz glass in hydrofluoric acid, fluorine and other fluorine-containing environment. The method comprises the steps that doped mixed solution is formed by dissolving and mixing a first doped compound and a second doped compound with dissolving agent, wherein the first doped compound is a compound containing aluminum, and the second doped compound is at least one of Zr-containing compound, Y-containing compound, La-containing compound, Sc-containing compound, Th-containing compound, V-containing compound and Ti-containing compound; a silicon dioxide loose body is soaked in the doped mixed solution, and is fired into the finished quartz glass. The finished quartz glass contains at least one of Al2O3 reformed by firing, ZrO2 reformed by firing, Y2O3, La2O3, Sc2O3, Th2O3, V2O5 and ThO2. Al2O3, ZrO2, Y2O3, La2O3, Sc2O3, Th2O3, V2O5 and ThO2 are filled in pores of a SiO2 tetrahedron network structure in the form of a network intermediate or a network modifier, and the quartz glass is resistant to sour corrosion.