Transfer window is a kind of auxiliary equipment of clean room, which is mainly used for the transfer of small articles between clean area and clean area, and between clean area and unclean area, so as to reduce the number of open doors of clean room and minimize the pollution of clean room. Transfer window made of stainless steel plate, smooth and clean. Double door interlock each other, effectively prevent cross contamination, with electronic or mechanical interlock device, and equipped with ultraviolet sterilization lamp.