The buckling of steel jacking-pipe under complex loads has been an important factor in construction because of the increasing of diameter and jacking distance. Numerical analysis on the buckling of long steel jacking pipe, whose distance-diameter ratio is larger than 100, is studied in this paper with finite element method (FEM). The first buckling mode of pipe-jacking under different loads are obtained by the buckle analysis. By introducing the first mode as the initial imperfection, the elastic-plastic buckling behavior of steel pipes is analyzed with the RIKS method. Both the buckling mode and ultimate load of buckling of the steel jacking pipe are discussed, and the buckling phenomenon in practice is verified. Parametric analysis shows that the stability of steel pipe can be improved by reducing friction and face resistance of pipe-jacking, and the jacking load of the pipes with high confining pressure should be carefully controlled.