The invention discloses a dust collection jig used for a PCB. The dust collection jig comprises a bottom plate, sliding devices, supporting rods, ejector rods, supporting plates, a top plate, first nuts, positioning rods, first gaskets, second gaskets, second nuts, a handle and the like. By arranging the supporting rods and the supporting plates above the bottom plate, a PCB substrate can be fixed above the supporting plates and is positioned through the positioning rods on the top plate, the dust collection operation can be conducted on the PCB substrate by only arranging a dust collection device above the top plate, operation is easy, the dust collection effect is good, and the labor cost is saved. A sliding device is arranged below the bottom plate, the sliding device can drive the PCB substrate above the bottom plate to slide for the small-diameter dust collection device, and therefore dust collection can be conducted on the whole substrate, and the dust collection effect is further improved. By forming positioning grooves in the top plate, forming through grooves in the supporting plates and positioning the PCB substrate through the positioning rods, the requirement for positioning PCB substrates of different sizes is met, and applicability is wide.