The invention discloses a ventilating heat insulating window which belongs to the field of industrial equipment. The ventilating heat insulating window comprises a window frame, a shutter frame, a guide rail, a shutter structure, a curtain plate and a reel, wherein the reel is arranged in the window frame. The shutter frame and the guide rail are respectively arranged at outside and inside of thewindow frame. The curtain plate winds the reel and is movably arranged in the guide rail. The shutter structure is arranged in the shutter frame. The curtain plate and the shutter structure are used for realizing communication between a steam engine room of a power plant with outside. The ventilating heat insulating window according to the invention has advantages of realizing smooth ventilation in summer and high sealing tightness in winter, keeping warm, saving energy and effectively preventing overlow or overhigh temperature in the steam engine room of the power plant. Furthermore because the shutter structure and the curtain plate are not made of brittle materials, no easy breakage of the shutter structure and the curtain plate in a use process is realized. Furthermore relatively highsealing performance between the curtain plate and the guide rail is realized, thereby ensuring normal operation of each equipment in the steam engine room of the power plant.