The patent abstract shows that the application relates to the technical field of permanent magnet motor, and provides an iron core punching sheet, a stator iron core, a motor and a new energy vehicle. The iron core punching sheet comprises a plurality of peripheral welding grooves, and the welding groove comprises a transition section, a welding section and a connecting section. When in use, the welding groove with welding section can effectively block the flow of magnetic force lines at the welding groove when the magnetic density is not saturated, and reduce the eddy current loss; when the magnetic density is saturated, it can reduce the concentration and mutation of electromagnetic exciting force, so as to reduce the motor noise.