The invention relates to an infrared image pick-up device used for a new energy automobile night vision assistant system. The device comprises a main body and an infrared emission device. The main body is provided with a protection mechanism. The infrared emission device is internally provided with an infrared emission mechanism. The infrared emission mechanism comprises a first driving motor, a first driving shaft, a translation block, bar-type teeth, a driven gear, a rotating shaft, a first infrared lamp, a second infrared lamp, and a buffer block. The protection mechanism comprises a protection plate, a rotation unit, and two driving mechanisms. The infrared image pick-up device used for a new energy automobile night vision assistant system performs position switching on the first infrared lamp and the second infrared lamp through the infrared emission mechanism, so a driver can select different infrared irradiation according to road conditions, a display screen clearly displays a front road, and safe driving at night is realized. Not only that, the protection plate is covered on a lens through the protection mechanism, but also a CCD is prevented from being damaged caused by light irradiating the internal of the main body through the lens, and devices in the main body are effectively protected.