Spatial angle measuring method based on crane

The invention discloses a spatial angle measuring method based on a crane. The spatial angle measuring method includes building a crane servo system which comprises a sensor, a cylinder and a movable joint, wherein the movable joint comprises a standing post, an upper arm, a lower arm, a telescopic arm and pitching joints, each pitching joint is provided with a 16-bit sensor used as a measuring element, and the 16-bit sensors are connected with one another through the cylinder. Spatial angles are measured by building an ideal coordinate system, time for arriving a single target point is shortened to be within 50 seconds, trajectory planning of the crane can be stably finished in a short time, and the application requirement for a crane automatic control system is completely satisfied.