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Based on Android mobile phone platform, a rapid and non-destructive method for measuring area of plant leaves was developed. After snapping the images which contained reference object with known area and plant leaf whose area would be measured, through image graying, smoothing, binarizing, geometric correcting and connected components labeling, the area of plant leaf could be obtained according to the values of pixels of reference object and plant leaf. Functionality and interface of the system were designed with programming techniques based on Android. Geometric correction method was provided for image tilt distortion problem. Many leaves of several plants, such as clover, hibiscus, wintersweet, maple, ginkgo and sakura were used as the object for experiment. Results showed that the system can effectively measure plant leaf area and is not restricted by leaf shape; the relative error of measured area is range from -2.9% to 2.7%.