Device and method for measuring orientation of flexible structural member in rigidity and zero stress state

The invention discloses a device and a method for measuring the orientation of a flexible structural member in a rigidity and zero stress state. The device comprises an overturning platform, a switching tool, a supporting tool A, a supporting tool B, a six-degree-of-freedom rotary table A, a six-degree-of-freedom rotary table B, a six-degree-of-freedom force measuring table A and a six-degree-of-freedom force measuring table B, the switching tool is mounted on the overturning platform; the supporting tool A and the supporting tool B are respectively mounted on the switching tool; the six-degree-of-freedom rotary table A is mounted on the supporting tool A, and the six-degree-of-freedom force measuring table A is mounted on the six-degree-of-freedom rotary table A; the six-degree-of-freedom rotary table B is mounted on the supporting tool B, and the six-degree-of-freedom force measuring table B is mounted on the six-degree-of-freedom rotary table B; during measurement, the structural member A and the structura