The invention relates to an anti-collusion digital fingerprinting method based on a code division multiple access and diversity technology, comprising the following steps of: distributing a user identification code consisting of multiple stages of numbers for each purchaser; dividing an original carrier image into sub-images when fingerprints are embedded, then embedding all stages of numbers of a user into local DCT (Discrete Cosine Transformation) coefficients of the sub-images in all the sub-images by adopting a CDMA technology; and when finding a dubious copy, by combining with the original carrier image, firstly, detecting all stages of numbers and fingerprint strength values corresponding to the numbers of the dubious user in each sub-image, then synthesizing detection results of all the sub-images by adopting a diversity technology, and accurately judging one collusion member. The invention has less influence on the quality of the carrier image, low complexity of collusion detection and high detection precision rate.