The utility model provides a prevent photovoltaic transformer metallic glass iron core structure of generating heat, wherein, this photovoltaic transformer metallic glass iron core structure includes: the metallic glass iron core is used for the magnetic conduction, set up in the silicon steel sheet of the inlayer of metallic glass iron core is used for keeping the intensity of metallic glass iron core the width direction of silicon steel sheet goes up different position departments and sets up a plurality of breachs in order to reduce the sectional area of silicon steel sheet, the winding, twine in the metallic glass iron core with on the silicon steel sheet for thereby the transmission electric current turns into the electromagnetic energy with the electric energy. The utility model discloses reduce the vortex that iron core internal cause magnetic leakage produced, eliminate iron core local overheat trouble, also can not destroy the structural strength of metallic glass iron core simultaneously.