Improved marine railing door hinge device

The utility model discloses an improved marine railing door hinge device in the field of shipbuilding, which comprises a door body, the door body is hinged with a fixed door frame, a connecting mechanism comprises a lower fixed plate fixedly mounted on the fixed door frame, an upper rotating plate mounted on the door body is arranged above the lower fixed plate, and a lower rotating plate mounted on the door body is arranged above the upper rotating plate. The upper rotating plate and the lower fixing plate are horizontally arranged and are respectively provided with a first through hole and a second through hole, the lower side of the lower fixing plate is coaxially provided with a fixing nut corresponding to the second through hole, the fixing nut is in threaded connection with a bolt, a base of the bolt is attached to the fixing nut, and the bolt sequentially penetrates through the second through hole and the first through hole upwards. The upper end of the bolt is sleeved with a positioning nut; the upper