A camera calibration method for image splicing, comprising: providing a calibration scale comprising a scale body and a calibration pattern arranged on the scale body, wherein the calibration pattern comprises at least two calibration pattern subsets (101, 102) arranged along a first direction of the scale body, and the at least two calibration pattern subsets comprise a plurality of first calibration blocks (10, 21) arranged at spacings along the first direction and staggered along a second direction of the scale body; and for each calibration pattern subset, projections of a plurality of first calibration blocks (10, 21) along the first direction have a first overlapping area (W1, W2), and a length (t1, t2) of the first overlapping area (W1, W2) along the second direction is less than or equal to a first preset threshold, wherein projections of at least two first overlapping areas (W1, W2) along the first direction have a second overlapping area; arranging the calibration scale on a surface of a target object; and for each of at least two cameras, determining a scan path of the camera based on at least one calibration pattern subset on the calibration scale, wherein the determining a scan path of the camera based on at least one calibration pattern subset on the calibration scale comprises: adjusting a location of the camera to scan the calibration pattern subset; adjusting a scan trajectory of the camera so that the camera sequentially scans all first calibration blocks (10, 21) in the calibration pattern subset; and determining, as the scan path, a scan trajectory obtained when projections of both a scan trajectory of the camera and a scan trajectory of an adjacent camera along the first direction completely fall within the second overlapping area. providing a calibration scale comprising a scale body and a calibration pattern arranged on the scale body, wherein the calibration pattern comprises at least two calibration pattern subsets (101, 102) arranged along a first direction of the scale body, and the at least two calibration pattern subsets comprise a plurality of first calibration blocks (10, 21) arranged at spacings along the first direction and staggered along a second direction of the scale body; and for each calibration pattern subset, projections of a plurality of first calibration blocks (10, 21) along the first direction have a first overlapping area (W1, W2), and a length (t1, t2) of the first overlapping area (W1, W2) along the second direction is less than or equal to a first preset threshold, wherein projections of at least two first overlapping areas (W1, W2) along the first direction have a second overlapping area; the calibration pattern comprises at least two calibration pattern subsets (101, 102) arranged along a first direction of the scale body, and the at least two calibration pattern subsets comprise a plurality of first calibration blocks (10, 21) arranged at spacings along the first direction and staggered along a second direction of the scale body; and for each calibration pattern subset, projections of a plurality of first calibration blocks (10, 21) along the first direction have a first overlapping area (W1, W2), and a length (t1, t2) of the first overlapping area (W1, W2) along the second direction is less than or equal to a first preset threshold, wherein projections of at least two first overlapping areas (W1, W2) along the first direction have a second overlapping area; arranging the calibration scale on a surface of a target object; and for each of at least two cameras, determining a scan path of the camera based on at least one calibration pattern subset on the calibration scale, wherein the determining a scan path of the camera based on at least one calibration pattern subset on the calibration scale comprises: adjusting a location of the camera to scan the calibration pattern subset; adjusting a scan trajectory of the camera so that the camera sequentially scans all first calibration blocks (10, 21) in the calibration pattern subset; and determining, as the scan path, a scan trajectory obtained when projections of both a scan trajectory of the camera and a scan trajectory of an adjacent camera along the first direction completely fall within the second overlapping area. adjusting a location of the camera to scan the calibration pattern subset; adjusting a scan trajectory of the camera so that the camera sequentially scans all first calibration blocks (10, 21) in the calibration pattern subset; and determining, as the scan path, a scan trajectory obtained when projections of both a scan trajectory of the camera and a scan trajectory of an adjacent camera along the first direction completely fall within the second overlapping area.