This study aims to formulate a conceptual framework for rereading green finance -based Islamic FinTech through the perspectives of Islamic Ecotheology, maqāṣid al-sharī'ah, and sustainability governance. Using a narrative literature review, this study synthesizes fragmented literature on Islamic FinTech, green finance, greenwashing, shariah governance, ecological governance, Islamic Ecotheology, and maqāṣid al-sharī'ah. The results of the study indicate that Islamic FinTech is still largely understood within a legal technical framework, particularly regarding service efficiency, financial inclusion, and contract compliance. At the same time, green finance faces the risk of greenwashing when green claims are not accompanied by evidence of impact. In the context of Islamic FinTech, this issue develops into a double legitimacy risk because green claims can meet with sharia claims that are not necessarily oriented towards maqāṣid. This study proposes shariah ecological governance as a conceptual framework that connects shariah screening, ecological screening, maqāṣid assessment, impact reporting, digital traceability, ecological shariah audit, and stakeholder accountability. The study's primary contribution lies in shifting the understanding of Islamic FinTech from a transaction platform to a maqāṣid- based impact accountability regime and ecological responsibility.