Hidden connecting structure and method for door head plate of ALC wall without door stack

The invention relates to the technical field of light partition wall board installation, and discloses a hidden connecting structure and method for a door head board of a door-stamper-free ALC wall. The top of the door head plate and the bottom of the wall beam are provided with hanging assemblies used for connecting the door head plate and the wall beam, and the hanging assemblies are used for bearing the gravity of the door head plate. The full-length bolts press the front and back faces of the door head plate and the front and back faces of the door stack door side plate, so that the front and back faces of the door head plate and the door stack door side plate are kept flush, and the door head plate is prevented from moving forwards and backwards relative to the door stack door side plate. A spring supporting piece is arranged on the contact face between the door head plate and the door-free buttress door side plate, and the door head plate and the door-free buttress door side plate are fixed through elas