Abstract: A chaotic digital anti-counterfeiting system is designed and implemented.At first, a new chaotic encryption algorithm to generate anti-counterfeiting code and identifying code is proposed on the basic of chaotic cryptography.Then an anti-counterfeiting mechanism of "two codes, two-way authentication" is adopted.And a digital anti-counterfeiting system inquired by telephone is constructed to realize intelligent identification.At last, the results of system testing show that the system is effective, convenient and practical to popularize.