The invention discloses a method for optimizing mobile social network data delivery. The method comprises following steps: performing cost conversion to influence index of online communication and offline communication, wherein the online communication is carried out by nodes carrying data package meeting encountering nodes and through making the nodes access to the internet, and the offline communication is carried out through a distributed method; calculating and comparing the cost value of data delivery by the two communication methods for the nodes carrying data package, and calculating and comparing the cost value of data delivery by the two communication methods for the encountering nodes; selecting data delivery method according to the comparison results for the nodes carrying data package. The method is suitable for a hybrid mobile social network enabling online communication by accessing the internet and offline communication by a distributed method, and can effectively increase data delivery efficiency in the mobile social network.