The present invention relates to a door hinge for heavy equipment. The door hinge according to the present invention includes: first and second plates disposed on a hinge shaft of a door of heavy equipment and hinge-coupled to each other to open and close the door; and a stay unit rotatably disposed on the first plate and supporting the second plate when the door is opened to prevent the door from being closed. According to the present invention, the limitation in which a separate door stay mounting bracket must be mounted on a door body to maintain an opened state of an existing door during the open of the door may be overcome. Thus, the opened state of the door may be maintained by using only the stay unit without having to mount the bracket.