Composite blocking remover for oil well and application method thereof

The invention relates to a composite blocking remover for oil well and an application method thereof. The composite blocking remover comprises two ingredients of A and B in a ratio of 1:5-8; the ingredient A comprises, by weight, 20-50 parts of chlorine dioxide maternal, 1-4 parts of heat-resistant agent, 10-20 parts of organic clay stabilizer, 5-10 parts of chlorine dioxide synergist and 5-10 parts of inorganic salt; and the ingredient B comprises, by weight, 30-60 parts of hydrophosphate, 2-6 parts of corrosion inhibitor, 1-5 parts of iron ion complexing agent, 5-12 parts of de-emulsifier, 4-12 parts of osmotic agent and 60-180 parts of water. The application method comprises steps that the ingredient A and the ingredient B are measured according to a formula and mixed with water; and the mixed liquor is injected into an oil well immediately. According to the invention, construction inconvenience and potential safety hazard caused by surface activation can be avoided, and construction frequency is reduced, so as to raise blocking removal effects by times.