Device, system and method for measuring aiming deviation of laser optical axis

The invention relates to a device, system and method for measuring aiming deviation of a laser optical axis, and relates to the technical field of high-energy laser, the device is used for measuring laser emitted by laser equipment, and the device comprises a cover body with an inner cavity, and a light path adjusting mechanism and a target surface assembly which are arranged in the inner cavity; the cover body comprises a hole allowing laser to enter the inner cavity and a connecting part connected with laser equipment in a matched mode; the light path adjusting mechanism is used for receiving the laser entering the inner cavity, adjusting the light path of the received laser and outputting the laser after the light path is adjusted; and the target surface assembly comprises a visible light emitter, a target and a focusing lens, the focusing lens is used for converging the output laser to form a light spot on the target, the visible light emitter is used for providing a light source for the target, and the l