The invention belongs to the technical field of chemical materials, and relates to a chemical blocking remover for an immovable string of an oil-
water well and a preparation method and application thereof, the chemical blocking remover comprises the following raw materials in percentage by
mass: 15-30% of a chelating scale dissolving agent, 0.5-1.5% of a
permeation solubilizer, 2.0-4.0% of an anti-scale stabilizer, 4.0-8.0% of a viscous stable
discharge aiding agent and water, wherein the chelating scale dissolving agent is one or a mixture of more than two of 1, 4, 7, 10-tetraazacyclododecane N-tetraacetic acid,
ethylenediamine tetraacetic acid and 3-methyl 1, 5, 8, 11-tetraazacyclotridecane N-tetraacetic acid. The blocking remover is a neutral
system and has
environmental protection performance; the blocking remover can be prepared and used on site, the construction technology is effectively simplified, the operation efficiency is improved, the cost is reduced, swabbing and liquid discharging are not needed, and the purpose of stably increasing the yield of the oil producing well is achieved.