The utility model relates to the technical field of electric electrons, in particular to a transformer. The clean energy transformer iron core water circulation cooling system comprises a transformer iron core and a water cooling system, wherein the transformer iron core comprises stacked magnetic steel sheets, and the water cooling system comprises a water flow pipeline through which water flow can pass. The energy transformer iron core water circulation cooling system is characterized in that the water cooling system further comprises a sheet-shaped iron core water circulation module which comprises a metal substrate, the water flow pipeline made of a metal tube is welded on the metal substrate, and the transformer iron core is embedded in the sheet-shaped iron core circulation module and is placed between two layers of magnetic steel sheets. The design has more outstanding advantages for transformers of clean energy such as solar energy, water energy and wind energy.