A single camera stereo vision sensor based on plane mirror imaging is researched on the basis of traditional binocular stereo vision sensor. Placing a plane mirror in front of charge coupled device (CCD) camera, a picture with parallax image is obtained by shooting target object and its virtual image. This is equivalent to shot the target object from different angles by the camera and the virtual camera in plane mirror, so it has the function of binocular stereo vision. The mathematical model of single camera stereo vision sensor is established. The impact of the parameters to the field range and the measurement accuracy is analyzed. The parameters of the sensor are designed, and the corresponding experiment has been done. The experimental results show that the measuring method is convenient and effective. It also has the advantages of simple structure, convenient adjustment, and is especially suitable for short distance measurement with high precision.