The invention relates to the technical field of bridge construction method, in particular to a long-distance curve segment main girder incremental launching method. A first part of girder segment is assembled on an assembling platform at an initial end of a bridge; incrementally launching the first part of girder segment to move to a design position in the bridge direction; assembling a second part of girder segment on the assembling platform; incrementally launching a second part of girder segment to move to a design position in the bridge direction; adjusting positions of the two parts of the girder segments so that the two parts of the girder segments are accurately butt-jointed; and then fixedly connecting the two parts of the girder segments in an integrated manner to form a curve segment main girder; and continuing to incrementally launch follow-up girder segments according to the construction process till all girder segments are integrally connected with each other. The long-distance curve segment main girder incremental launching method has the advantages that the incremental launching construction method is simple, the operation is convenient, the bridge construction difficulty can be greatly reduced, the bridge construction cost can be greatly reduced, and great popularization values are realized.