In order to accurately calibrate the dualband camera system with visible light and infrared lens, reduce the number of calibration plates and increase the adaptability to the camera response band, a dualband adaptive calibration checkerboard based on the Peltier effect is designed, which solves the problem of the difficulty in manufacturing largesize calibration plates. Different intensity infrared radiation is generated by controlling the current in the circuit, achieving the adaptation of the response band of the camera system. It can be seen from the images taken by the binocular ultrawide angle longwave infrared camera that the calibration checkerboard has a large number of points, which can meet the requirements of large field of view. Besides, the calibration corners are clear, the contrast is high, and the infrared radiation uniformity and the stability are good. After the performance test, the calibration corner reprojection error reaches the subpixel level, the calibration parameter error is within 1%, and distortion correction effect is good.