Measuring tool and measuring method for detecting distance from inner hole to end face

The invention discloses a measuring tool and a measuring method for measuring the distance from an inner hole to an end face, a reference seat is set as a horizontal part and a vertical part, and the lower end of the horizontal part can be attached to the upper end face of a to-be-measured workpiece, so that the lower end face of the horizontal part can be used as a reference surface when the to-be-measured workpiece is measured; the measuring rod on the vertical part is matched with the inner hole of the workpiece to be measured through the through hole in the vertical part to form a measuring reference in the horizontal direction, the measuring rod is moved to approach the inner hole of the workpiece to be measured under the constraint of the horizontal reference surface and the measuring rod, if the measuring rod can extend into the inner hole of the workpiece to be measured, the pitch of the workpiece to be measured is qualified, and if the measuring rod cannot extend into the inner hole of the workpiece