Positioning device for adjusting saw blade shafts of multi-saw-blade woodworking machine

The invention relates to a positioning device for adjusting saw blade shafts of a multi-saw-blade woodworking machine. The positioning device comprises an eccentric wheel mechanism arranged on a box body of the multi-saw-blade woodworking machine. The first saw blade shaft and the second saw blade shaft are vertically and oppositely arranged on the box body. The portions, corresponding to the front mounting shaft hole position and the rear mounting shaft hole position of the first saw blade shaft, on the box body are correspondingly provided with assembling circular holes with the same diameter and tolerance. The two assembling circular holes are correspondingly provided with eccentric wheels matched with the assembling circular holes. A mounting hole for mounting the first saw blade shaft is formed in the eccentric shaft position of each eccentric wheel. The assembling circular holes of the eccentric wheels are internally in a rotatable transition fit. A clamping hole is formed in the outer side of the first