The spiral pipe structure comprises the separation column, a spiral square pipe and two adjusting blocks, each adjusting block is of a circular ring structure, the separation column is sleeved with the hollow portion of each adjusting block, the end faces of the sides, close to each other, of the two adjusting blocks are inclined planes, and the two inclined planes are parallel to each other. Thespiral square pipe is spirally wound on the separation column and arranged between the two adjusting blocks, the two sides of the spiral square pipe abut against the two adjusting blocks respectively,a pipe inlet hole and a pipe outlet hole are formed in the first disc, and the two ends of the spiral square pipe extend out of the pipe inlet hole and the pipe outlet hole respectively; the end, extending out of the pipe inlet hole, of the spiral square pipe penetrates through the adjusting block close to one side of the first disc, the cross section of the spiral square pipe is of a rectangularstructure, the long edge of the rectangular structure is parallel to the axis of the separation column. By means of the device, the technical problems existing in the prior art can be solved: when atwo-phase interface in the circular tube is eccentric, radial mixing is insufficient, and the axial inclination of the spiral tube is difficult to control.