The invention discloses a porous bionic cranial repair structure based on additive manufacturing, comprising an outer fixing sheet and an inner fixing sheet connected with each other through a connector. The connector is used herein to connect the outer fixing sheet and the inner fixing sheet in releasable manner; the shape of the external fixing sheet and the internal fixing sheet is identical with surface shape of defective tissues; the external fixing sheet is positioned on the outer surface of the defective tissues; the internal fixing sheet is arranged on the inner surface of the defective tissues; the connector in the middle helps fix implanted tissues after defect occurrence, peripheral growth of the connector for the effective tissues is benefited, and tissue compatibility is improved.