According to the requirements for image analysis and identification ability from state in 2010 published "identifying instrument general technical conditions", the paper currency image authentication function is added in the traditional counting money machine. At present, domestic mainstream counting machine, banknote at a speed of 20 frames per second or so, in order to match the speed and ensure the accuracy, a high speed image acquisition method based on contact image sensor and DSP and programmable logic device CPLD is proposed. A large number of experiments show that at the same time to complete collection three high quality images of the visible light, infrared image and ultraviolet image just need 40.5ms, to meet the requirements for current market currency count machine sheet of paper 50 millisecond speed.