The invention discloses an adaptive visible watermark adding method of digital image of a mouse picking-up and adding position on the basis of .NET. The adaptive visible watermark adding method comprises the following steps: obtaining an original image waits to add a watermark and a watermark image; obtaining a specific position, which is clicked by a mouse, of the original image; obtaining a RGB (Red, Green, Blue) image of the original image and the RGB image of the watermark image, and partitioning; solving the mean of the gray level of the original image and the gray level value of each subblock, and calculating a watermark embedding coefficient; obtaining the Y, U and V components of each block of the original image, and obtaining the Y component of the watermark image; combining the Y component of the original image subblock with the Y component of the watermark image subblock by utilizing the watermark embedding coefficients of the subblocks to form a new Y component; and combining the new Y component with the U and V components to form the image in which the watermark is embedded, and displaying in a webpage. The watermark can be added on any position of the original image, and the added watermark is clear, slightly influences the quality of a colorful image and is especially suitable for displaying the copyright of an identified image through the internet.