The utility model belongs to the technical field of articles for daily use, concretely relates to door -hinge, door closing device and door. The utility model discloses a door -hinge, including the door -hinge body, the door -hinge body includes and twists reverse spacing section, adjusts section and torque rod joint section to what connect gradually down from last, the torque rod joint section isthe cylinder, is provided with the spacing hole of axial torsion bar in the bottom of torque rod joint section, it personally experiences sth. Part of the body for the polygon prism to adjust the section, it for the cylinder, is provided with at least one radial adjust through hole to twist reverse spacing section on twising reverse spacing section. Compare in current traditional door closing device, door closing device leads to the structural design of over twisting pole, realizes automatic function of closing the door, simultaneously, through -hole on the door -hinge sleeve of the epaxial adjust through hole of passing -through door, first hinge and limiting bolt's cooperation, but the size of freedom adjustment torsion, consequently the utility model discloses a door -hinge, door closing device and door be applicable to on each big, little equipment product all can, it is extensive to use the scene.