Workpiece point location three-dimensional coordinate acquisition device, method and system

The invention discloses a workpiece point position three-dimensional coordinate acquisition device, method and system, and the device comprises a moving mechanism which is used for placing a workpiece, and the workpiece is marked with a first workpiece point; the imager is arranged on the moving mechanism, and the imager is used for imaging the first workpiece point; the laser is arranged on the moving mechanism, and the laser is used for emitting light to determine the position of the first workpiece point; wherein the optical axis of the imager and the light emitted by the laser intersect to form an intersection point. The moving mechanism drives the imager and the laser to move synchronously, so that the first workpiece point is located in the image collected by the imager, the moving parameters of the imager are obtained, the laser continues to move, the first workpiece point is aligned with the intersection point, and the three-dimensional coordinates of the first workpiece point are obtained; and the ac