The invention relates to a method for controlling parameters of processes of calcifying and roasting vanadium slag by using a large rotary kiln during production of vanadium oxide, belongs to the field of metallurgy and provides a method for controlling parameters of processes of calcifying and roasting vanadium slag during production of vanadium oxide. According to the method, the large rotary kiln is used for calcifying and roasting the vanadium slag; the control method comprises the following steps: a, firstly adjusting various parameters of the large rotary kiln to reasonable ranges in sequence according to the following sequence of negative pressure, combustion-supporting air flow, oxygen flow, temperature of the rotary kiln and gas flow; and b, finely adjusting the rotary kiln door to control the stability of various parameters in the step a in sequence according to the following sequence of the gas flow, the temperature of the rotary kiln, the combustion-supporting air flow, the oxygen flow and the negative pressure. The method is capable of ensuring the stability of various process parameters; meanwhile, the method can be used for producing black, loose and high-quality roasted clinker with few particles; the roasted clinker is liable to crush; the conversation rate of the acid-leached vanadium can reach up to 85-92%.