The invention discloses a welding material and a welding method for welding a transition layer of a Ti-pipeline steel composite board. The welding material comprises a near-Ti-layer welding material and a near-steel-layer welding material, wherein the near-Ti-layer welding material comprises the components as follows: 52-58% of Ni, smaller than or equal to 0.04% of C, smaller than or equal to 0.007% of N, smaller than or equal to 0.035% of O, smaller than or equal to 0.001% of H and the balance of Ti; and the near-steel-layer welding material comprises the components as follows: 3.15-3.35% of Mn, 18-27% of Cr, 0.01-0.015% of Cu, 0.35-0.55% of Ti, 0.03-0.04% of Co, 1.8-2.0% of Nb, 0.2-0.6% of Ta, smaller than or equal to 0.02% of C, smaller than or equal to 0.025% of Si, smaller than or equal to 0.002% of P, smaller than or equal to 0.002% of S, smaller than or equal to 0.75% of Fe and the balance of Ni. According to the welding material and the welding method, the fusion welding butt joint of the Ti-pipeline steel composite board is realized, a welded joint has excellent obdurability, and the welding efficiency is high.