Wood structure cross beam based on self-tightening dovetail joint and construction method thereof

The invention discloses a wood structure cross beam based on self-tightening dovetail tenons and a construction method thereof.The cross beam comprises a cross beam body formed by connecting a main beam and a secondary beam, the joint face of the main beam and the joint face of the secondary beam are each provided with at least one group of mortises and tenons which are matched with each other, and the shape of each tenon is a semi-ellipse formed by dividing the ellipse into a short axis; the root of the tenon is narrow, and the end of the tenon is wide. According to the large-span wood beam, the main beam and the secondary beam can be correspondingly connected to form the cross beam through the semi-elliptical tenon and the tenon groove which are respectively arranged on the main beam and the secondary beam and have narrow roots and wide ends, so that the problem that the bearing capacity is reduced due to drilling on the beam is avoided, and the bearing capacity of the large-span wood beam and the integrity