Overhead three-dimensional detection jig

The utility model provides an overhead type three-dimensional detection jig which comprises a base and a positioning component arranged on the base. The positioning component comprises a bottom beam, a first stand column, a second stand column and a supporting piece, the first stand column is fixedly erected on the bottom beam, the second stand column is adjustably erected on the bottom beam in the x-axis direction, and in the x-axis direction, a detection position is formed between the first stand column and the second stand column; the first stand column and the second stand column are each provided with a supporting piece with the installation position capable of being replaced in the z-axis direction, and the supporting pieces stretch into the detection positions. The overhead type three-dimensional detection jig can adjust the positions of the supporting pieces in the x-axis direction and the z-axis direction according to the size of the workpiece to be detected and the overhead supporting position, and