The invention relates to the technical field of constructional engineering, in particular to a door body structure which is scientific and reasonable in design and capable of effectively reducing the door opening and closing resistance. A case, a first side column and a second side column are assembled in a matched mode and are all fixed to a civil engineering structure, a main rotating shaft connected with a rotating support arm is arranged in an inner cavity of the first side column, the rotating support arm is hinged to the door body, a hydraulic door closer is arranged in an inner cavity of the case, a support arm of the hydraulic door closer is movably connected with the door body, and a line shaft slide groove is further formed in the lower end face of the case and matched with a line shaft sliding wheel assembly on the upper edge face of the door body. When the door is opened, the main rotating shaft rotates synchronous with the door body, and the line shaft sliding wheel assembly slides along the line shaft slide groove of the case; when the door is closed, the door body automatically returns through the hydraulic door closer. When a leaf of the door easy to push is pushed open, the door can be opened by means of wind pressure, and the design is particularly suitable for large door bodies.