The invention refers to a kind of optical scanner which has pinhole imaging device, it uses the pinhole imaging device to replace the lens imaging device, and the device is at the front of the optical sensor in order to receive the shooting light after scanning the file,s and focuses the scanned image onto optical sensor, when the radius of the pinhole is small or equal to the size of the pels onthe optical sensor, the image light focuses on the optical sensor through the pinhole imaging device and gets the picture, the resolution ratio is good and these isn't light dispersive effect.