Piston rod verticality detection mechanism

The utility model belongs to the technical field of perpendicularity detection, and particularly relates to a piston rod perpendicularity detection mechanism which comprises a perpendicularity detection guiding rule, two positioning connecting pieces are assembled on one side of the perpendicularity detection guiding rule, positioning notches are formed in the two positioning connecting pieces, the two positioning notches are vertically opposite to each other, and the two positioning connecting pieces are arranged on the other side of the perpendicularity detection guiding rule. The upper side, the lower side and the side, away from the vertical detection guiding rule, of the positioning notch are open, the opening size of the positioning notch is gradually increased from the end close to the vertical detection guiding rule to the end, away from the vertical detection guiding rule, of the positioning notch, and the horizontal section of the positioning notch is arranged in a centerline symmetry mode. The vert