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Information security in the mobile Internet is currently a hotspot in researches. Starting from encryption of finger vein image, this paper first extracts characteristics of the finger vein image, and gets the size of vein image through establishing image smoother as well as the collected image of vein features through selecting the darkness area and characteristic features. Then, this paper adopts the function based on wavelet, Android mapping, the quadratic Logistic mapping and Baker transform to encrypt the vein image. Conduct experiment to compare the correlation analysis and differential attack analysis, and the results show that algorithm in this paper is safe and costs less time, so it is suitable to promote it in the mobile Internet.