Transparent wood has emerged as a more energy efficient and environmentally friendly alternative to glass for use as windows because of its renewability, low thermal conductivity, and high mechanical strength. Up to date, remarkable efforts have been dedicated to developing wood-based window devices for building energy efficiency and thermal management. In particular, thermochromic transparent wood smart windows with passive and reversible thermochromism, outstanding solar-radiation regulation ability as well as excellent mechanical and thermal properties, have the potential to be a novel yet promising generation of smart windows. Organic-inorganic halide hybrid perovskite is a new type of thermochromic material for smart windows, featuring remarkable visiblelight regulation and keen response to ambient temperature. However, no work has yet been found about thermochromic transparent wood enabled by halide hybrid perovskite. In this work, for the first time, halide hybrid perovskite is incorporated in wood-based thermochromic smart windows by facile methods, and perovskite thermochromic transparent wood (PTTW) is demonstrated with great solar modulation ability of about 18% which enables effective thermal regulation, as well as favorable clear-state luminous transmittance of about 65% which ensures visuality. Moreover, the PTTW also possesses low thermal conductivity of about 0.2 W/(m·K) and high tensile strength of about 60 MPa along the longitudinal tangential direction, manifesting excellent thermal and mechanical performance for building applications. Overall, this work sheds light on the newer and greener generation of smart windows, accelerating the development of energy-efficient and sustainable buildings.