The invention discloses a three-phase three-limb amorphous alloy dry type transformer iron core and a manufacturing method thereof. The iron core comprises an outer frame iron core body, two inner frame iron core bodies, coating layers and an E-type pull plate. The two inner frame iron core bodies are arranged in the outer frame iron core body side by side. The outer frame iron core body and the two inner frame iron core bodies each comprises a top end, a bottom end, a core column connected between the top end and the bottom end and an iron core lap arranged at the top end, the end face of the outer frame iron core body and the end faces of the inner frame iron core bodies are coated with the coating layers, and the E-type pull plate is connected to the outer side faces of the core columns and the outer side faces of the bottom ends through the coating layers.