Positioning device for machining power-assisted support mounting hole

The utility model provides a positioning device for machining a mounting hole of a power-assisted support, the power-assisted support comprises a main support body and a sub-support body, and a positioning tool comprises a base, a first XY-direction positioning seat, a Z-direction positioning seat and a first pressing plate; the first XY-direction positioning seat is fixed to the top of the base. A first supporting plate is fixed to the front side of the first XY-direction positioning base. A first pressing bolt is connected to the first supporting plate through a bolt. The Z-direction positioning seat is fixed at the top of the base; the top of the Z-direction positioning seat is provided with a second groove used for supporting the upper side branch frame body, and meanwhile, a first receding hole is formed in the position, located on the left side of the second groove, of the top of the Z-direction positioning seat; a through hole is formed in the bottom of the Z-direction positioning seat; the two ends of