Welding die with easy-to-tear opening

The utility model discloses an easy-to-tear mouth welding die which comprises a first die and a second die which are oppositely arranged, the first die and the second die are respectively installed on a welding head of an ultrasonic welding machine and an equipment welding table, the surface of the second die is a smooth plane, and the first die is an integrally-formed square block. A first protruding structure and a second protruding structure are arranged on the surface, the first protruding structure is a splayed protrusion or a U-shaped protrusion or a plurality of angular protrusions, and the second protruding structure is a linear protrusion and is arranged in a space defined by the first protruding structure. The welding die is designed to be the second die with the smooth surface and the first die with the protruding welding surface, installation and debugging are easy, welding spots are evenly stressed in the welding process, the welding quality meets the requirements for uncovering an easy-to-tear o