This invention discloses a process for producing V2O5 from vanadium-containing stone coal or vanadium slag. The process comprises: adding M-1 type additive to vanadium-containing stone coal or vanadium slag, torrefying, leaching with diluted H2SO4 to obtain vanadium salt solution, extracting vanadium aggregate from the vanadium salt solution by using N-1 type aggregation agent, removing impurities, adding P-1 type separation agent for separation, precipitating vanadium, oxidizing to obtain V2O5, recovering Al and Fe from the system, and producing Al2 (SO4)3 and iron red. The process has such advantages as no Cl2 or HCl generation, high torrefaction yield (70-90%), no wastewater, little environmental pollution, high product yield, low production cost, high recovery rate of Al and Fe, high product purity (higher than 99%), simple process and stable oepration.