Cylindricity measuring clamp for plunger hole of cylinder body

The utility model discloses a cylinder body plunger hole cylindricity measuring clamp. The cylinder body plunger hole cylindricity measuring clamp comprises a base (1), a directional block (2), a quick-change pin (3), a guide pin (4) and a pressing assembly for fixing a cylinder body (5) to the base (1), a first positioning hole (11) matched with the quick-change pin (3) is formed in the base (1); the orientation block (2) is connected with the base (1) in an inserted mode, a cantilever (21) is arranged on the top of the orientation block (2), a second positioning hole (22) matched with the guide pin (4) is formed in the cantilever (21), and the second positioning hole (22) and the first positioning hole (11) are coaxial; a T-shaped groove (12) is formed in the top face of the base (1), the length direction of the T-shaped groove (12) penetrates through the axis of the first positioning hole (11), and one end of the T-shaped groove (12) is located on the side wall of the base (1). The device has the advantage