The invention discloses a downhole tubular column for filling through-hole geopolymer to achieve sand prevention and a reversing filling method. The tubular column comprises a reverse filling tool, anouter tubular column and an inner tubular column, the lower end of the reverse filling tool is connected with the outer tubular column and the inner tubular column simultaneously, the outer tubular column sleeves the outer side of the inner tubular column, an inner annular space is formed between the outer tubular column and the inner tubular column, an outer annular space is formed between the outer side of the outer tubular column and the inner side of a casing pipe, and the inner tubular column, the outer tubular column, the casing pipe and the stratum outside the casing pipe are in a communicating state. The outer tubular column comprises short joints, sifting pipes and sand setting pipes, wherein the short joints, the sifting pipes and the sand setting pipes are connected in sequencefrom top to bottom, and the upper ends of the short joints is connected to the outer side of the lower end of the reverse filling tool. The bottoms of the sand setting pipes are connected with screwed plugs. By means of the downhole tubular column for filling the through-hole geopolymer to achieve the sand prevention and the reversing filling method, the purposes that the geopolymer stratums aresqueezed, annularly cycled and foamed and solidified are achieved, and the downhole tubular column has the advantages of being large in drainage, low in pressure, easy to release and the like.