Document anti-counterfeiting system based on internet was realized, which run on the theory of cloud print. Through the browser, users access the document security website, then upload document and added shading and QR code in the document for anti-counterfeiting; also, the other method is embed bitmap image into halftone image to achieve security. Microsoft Visual 2010 was used as development tool, C# as development language, and SQL Lite as database. The system enables the anti-counterfeiting no longer constrained by security software installed on local computer, and the realization of document security become more convenient. With the popularity of Cloud Print, the system will be used more extensively.