To solve the problem of the current device's narrow detection band, small size of the detected spot and low power, a common-aperture spot detection device is designed. The design content and results of the device in terms of hardware and software are introduced respectively. By adopting the common aperture of imaging units in three bands of near infrared, medium infrared and far infrared, and integrating laser range and point source detection, the effective detection of continuous and high frequency laser spot is achieved. By combining the image algorithms such as adaptive threshold segmentation and Zernike moment edge detection, the angular second level measurement of many parameters of the spot is realized. For near infrared imaging, medium infrared imaging and far infrared imaging units, the measurement error of spot position is 16.5″, 27.5″, 26.4″ respectively. The detection equipment has solved problems in multi band, large size, high power laser spot detection, effectively promoting the further development of laser measurement technology.