The invention discloses a high-speed differential signal conversion circuit for a remote sensing CCD camera. According to the circuit, signals are transmitted in an alternating current coupling mode, a demand for short distance signal transmission can be satisfied, and a demand for long distance signal transmission among devices also can be satisfied. According to the circuit, a current output channel is provided for a signal sending end by employing a direct current discharge channel; a common-mode voltage and a difference-mode voltage satisfying demands are provided for a signal input end by employing a voltage dividing network; impedance of high-speed differential signals are matched by employing a matching network; output signals are processed by the above-mentioned network, so the high-speed differential signals which are output by the sending end and do not satisfy receiving demands are processed into the signals satisfying level demands of a receiving end. According to the high-speed differential signal conversion circuit for the remote sensing CCD camera, high-speed signals are converted, and moreover the circuit is characterized in high reliability, simple employed devices, small occupation space, flexible adjustment, high adaptive capacity, long transmission distance and high isolation performance. The demands of astronavigation applications can be satisfied well.