Mobile phone charger with mutually-embedded frameless ultrasonic welding structure

The utility model relates to a mobile phone charger with a mutually-embedded frameless ultrasonic welding structure. The mobile phone charger comprises a shell and a bottom cover, the upper surface of the bottom cover is provided with a first connecting rib and a second connecting rib, the first connecting rib and the second connecting rib form a plurality of units which are annularly distributed along the edge of the upper surface of the bottom cover, and the inner wall of the shell is concavely provided with a first caulking groove and a second caulking groove which are matched with the first connecting rib and the second connecting rib respectively. A first welding strip for ultrasonic welding is longitudinally arranged on the side wall, facing the first caulking groove, of the first connecting rib, a second welding strip is longitudinally arranged on the inner wall of the second caulking groove, the outer diameters of the first welding strip and the second welding strip are gradually reduced from top to b