The invention discloses an urban flood-control drainage well water guide and pollutant blocking apparatus and method. The urban flood-control drainage well water guide and pollutant blocking apparatus comprises a pollutant blocking structure, a water guide structure, an air guide rod and a fixed ring; the pollutant blocking structure comprises a pollutant blocking net, a slag collection pool and an air guide rod; the pollutant blocking net is of an annular shape and of a stainless steel netted structure and has certain flexibility; the slag collection pool is of a bowl shape with interior recessed and of a stainless steel netted structure; an outer ring of the slag collection pool is connected with an inner ring of the pollutant blocking net by virtue of a hinge; the air guide rod is a hollow stainless steel pipe and penetrates through the center of the slag collection pool; and the urban flood-control drainage well water guide and pollutant blocking apparatus can rapidly guide the discharge of the accumulated rainy water, pollutants are automatically collected; and meanwhile, convenience in disassembling, installation and application can be realized, and a purpose of effectively guiding the water and blocking pollutants can be realized.