A door hinge is adapted to connect a door to a vertical metal post of a sectional rack, so that an enclosed storage space may be provided on the sectional rack. The door hinge includes a fixing member for connecting to the door, a hanger for hooking to the vertical post, an adjusting member connected to the hanger, and a turning member, a spring leaf, and a torsion spring mounted between the adjusting member and the fixing member. A cushion pad is positioned between the hanger and the post and forced against the post by a tightening screw, so that two hooks provided on the hanger may be tightly engaged with hook eyes provided on the post. The door connected to the fixing member may therefore be pivotally connected to the vertical post.