A portable day and night double purpose night vision equipment circuit for working at day and night two kinds environment is provided, which includes an imaging circuit used to obtain images, an image decoding and displaying circuit used to decode a video signal from an image obtained by the imaging circuit and display the image, a power supply and main control circuit used to provide a qualified power supply and image signal channel for imaging circuit and image decoding and displaying circuit and control a variety of application functions of whole machine. The said imaging circuit is a CCD imaging circuit. The said image decoding and displaying circuit uses micro display and outputs a color image under a light and weak light environment. Using combination with CCD chips, obtaining image is ensured under an environment of presence of light. In addition, the night vision equipment has a built-in infrared light source, outputting color images under the presence of light and weak light and outputting black and white images in the plain black case. Under the environment of presence of light an observation distance is infinity, under the weak light the observation distance is greater than 600 meters and in the environment of plain black the observation distance is less than 250 meters.
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