The invention discloses a device used for the imaging and checking to a moving target rapidly, comprising a channel for the moving target to pass through; a scan imaging device which images the moving target by emitting radiant flux to the moving target passing through the channel and then checks the moving target; a first detecting unit which is used for judging whether the moving target enters the channel and counting the number of the moving target entering the channel; a second detecting unit which is used for measuring the moving speed of the moving target in the channel; and a control unit which controls the second detecting unit to detect the moving speed of the moving target according to the detecting signals received from the first detecting unit about the moving target entering the channel, and controls the scan imaging device according to the measuring result of the second detecting unit, so that the scan imaging device emits radiant flux at a frequency corresponding to thespeed of the moving target, thereby checking the moving target.