The invention discloses a long well section gravel filling well completion pipe string and a technological method, and belongs to the technical field of well completion in oil and gas field development. The pipe string comprises a drill pipe string (1), a suspension assembly (2), a one-way valve (3), a sand blocking pipe (4), an oscillation assembly (5) and a guide piece (6), the suspension assembly (2) comprises a first pipe body (21), the drill pipe string (1), a second pipe body (22) and the oscillation assembly (5) which are sequentially connected, and the oscillation assembly (5) is usedfor vibrating liquid when passing through the oscillation assembly; and the first pipe body (21), the sand blocking pipe (4) and the guide piece (6) are sequentially connected. According to the long well section gravel filling completion pipe string, by means of the oscillation effect of the oscillation assembly (5), the compactness of a long well section gravel filling layer (7) is fully guaranteed, the long well section gravel filling efficiency is improved, and the sand prevention completion efficiency is guaranteed.