A welding structure includes a first object and a second object connected to each other. The first object includes a first surface, a second surface, a first bonding surface, a welding portion and a second bonding surface. The first bonding surface is connected to one side of the second surface away from the first surface. The welding portion is disposed on a surface perpendicular and connected to the first bonding surface. One side of the second bonding surface is connected to the welding portion. The second object includes a third surface, a fourth surface, a third bonding surface and a fourth bonding surface. The third bonding surface is corresponding to the first bonding surface and connected to one side of the fourth surface away from the third surface. The fourth bonding surface is corresponding to the welding portion and the second bonding surface.