Spatial cross positioning system and method

The invention discloses a spatial cross positioning system and method, and the system comprises a first universal laser with a first movement track, and a second universal laser with a second movement track. And the first universal laser and the second universal laser respectively stay at a position An on a first motion track and a position Dn on a second motion track through position information sent by the controller, and respectively emit a first fan-shaped laser and a second fan-shaped laser which are intersected at a straight line where a target vector BC is located. Any universal laser in the positioning system provided by the invention has the motion trail preset by the system, so that a plurality of feasible position combinations are provided for the space vector where the same target is positioned, the intersection angle gamma of the two paths of laser in the space can be selected, and the positioning accuracy is improved within the range allowed by the system. A laser intersection which can meet vis