Scan control method and scanning device

The invention provides a scan control method and a scanning device; the scan control method comprises the following steps: an image sensing processing unit sends a first trigger signal; after the first trigger signal is received and a first time period passes, a projection processing unit projects a first projection image of various projection images to a to-be detected object in a second time period, and a second trigger signal is sent out before/when the first projection image is projected; after the second trigger signal is received and a third time period passes, the image sensing processing unit shoots the to-be detected object in a fourth time period so as to obtain a first shooting image; when the to-be projected plurality of projection images are all projected, the projection processing unit sends an image reset signal; according to the received image reset signal and to-be detected object shooting frequency, the image sensing processing unit can determine the first shooting image is the image obtaine