Time delay calibration method, device and system

The embodiment of the invention provides a time delay calibration method, device and system. The time delay calibration method, device and system are used for calibrating time delay between home terminal equipment and remote equipment under the condition that line side interfaces of the home terminal equipment and the remote equipment are different. The method comprises the following steps: a first device receives a correction value of a first timestamp from a second device; wherein the first timestamp is the moment when a second framing module in the second equipment outputs a first stamping frame header, and the correction value of the first timestamp is the moment when the second equipment inputs a second optical module in the second equipment according to the first reference frame header and the moment when the second optical module outputs the first reference frame header; the time delay of the first reference frame header penetrating through the second optical module is equal to the time delay of the se