Paper money identifying method and device

A paper money identifying method and device are provided. The transmission image of the region transmitted by light beam is collected. In the region, there is windowed security thread impression feature on paper money. The impression feature in the image is analyzed and identified. Thus, a determination is made whether the paper money is true. The paper money identifying method and device have the advantage of good adaptability to money type, low hardware cost, high detection and identification ratio, and stable and reliable performance.