Cylinder sleeve inner diameter measuring device and measuring method

The invention discloses a cylinder sleeve inner diameter measuring device which comprises a three-jaw type base, that is, a first base, a second base and a third base, wherein a linear guide rail is mounted on each base; a sliding block sliding along the linear guide rail is mounted on each linear guide rail; and a sensor installation plate is mounted on each sliding block. The outer end of the sense installation plate is provided with a laser range finding sensor; and one side of the sensor installation plate is provided with at least two V-type grooves, and one side of the V type grooves on the base is provided with a ball-head column piston fixing block; and the ball-head column piston fixing block is provided with a ball-head column piston. The center of the three-jaw base is provided with a round protruding station; and the three-jaw base is arranged in the calibration base of the cylinder sleeve inner diameter measuring device. According to the invention, it is possible to realize the adjustable convers