Detection method and system of offset of contact net

The invention relates to detection method and system of the offset of a contact net. The detection method comprises the following steps: arranging a detection target at a detection point of a contactnet; capturing the displacement of the detection target in a three dimensional space by adopting a camera under the action of natural external force, taking the offset of the detection target in a twodimensional image of an imaging plane of the camera on the camera, and computing the offset of the contact net at the detection point. The detection method and system of the offset of the contact netare fully electrically isolated from the ground without high voltage protection; the contact net electrical noise influences the system a little and basically does not radically interfere in the detection result. The invention can detect the offset of the contact net under high wind environment in real time, records amplitude, frequency, torque angle and corresponding time interval curve of the contact net in real time, and provides accurate real-time state data support for electrical train operation and contact net maintenance under high wind or other external force environments.