Blade vapor flow test fixture

The invention discloses a blade vapor flow test fixture. The fixture comprises a datum plate, wherein four supporting columns are fixed to the four corners of the lower surface of the datum plate, supporting plates are fixed to the upper surface of the datum plate through a first glue layer, and the left supporting plate and the right supporting plate are arranged oppositely; a breather pipe is installed in a middle reserved hole of the each supporting plate, and the axes of the two breather pipes coincide; and a workpiece is arranged between the two supporting plates. The blade vapor flow test fixture is simple in structure and convenient to use; clamping is performed through the two supporting plates, sealing is performed through a hold-down plate and a locating plate, and therefore thestability of clamping is guaranteed; the first glue layer and a second glue layer are arranged, so that the sealing effect is guaranteed; the position of the hold-down plate can be adjusted through screws and a front pressing