Efficient blocking remover for polymer-flooding oilfield composite blockages as well as preparation method and application of efficient blocking remover

The invention relates to an efficient blocking remover for polymer-flooding oilfield composite blockages and a preparation method and application of the efficient blocking remover. The blocking remover comprises the following raw materials in percentage by mass: 0.5-1% of a polymer degradation agent, 1-5% of acid liquor, 0.5-1% of a crude oil emulsifier, 0.5-1% of a corrosion inhibitor and the balance of water. The efficient blocking remover for the polymer flooding oilfield composite blockages contains the crude oil emulsifier, so that thick oil on the surfaces of the composite blockages can be stripped conveniently, polymers and inorganic scales can be better removed by the acid liquor and the polymer degradation agent in a system, and composite blockages formed by the polymers, the thick oil and the inorganic scales can be effectively removed. The viscosity of the blocking remover is close to that of clear water, construction is convenient, and special injection equipment is not needed. 本发明涉及一种用于聚驱油田复合堵塞物的