Bar measuring device and method and storage medium

The invention provides a bar measuring device and method and a storage medium, and the device comprises a diameter measuring instrument module which comprises a diameter measuring instrument support and two diameter measuring instruments, the diameter measuring instrument support can slide in the axial direction of a to-be-measured bar, and the two diameter measuring instruments are arranged on the diameter measuring instrument support and are arranged in the circumferential direction of the to-be-measured bar at 90 degrees; the two diameter measuring instruments are used for measuring x-axis and y-axis coordinates of the circle centers of a plurality of sections of the bar to be measured at different axial positions in real time; the axial measurement module comprises a grating ruler and a grating ruler code scanning head and is used for measuring z-axis coordinates of the circle centers of a plurality of sections of the bar to be measured at different axial positions in real time; and the processor is used