The invention relates to a third-party payment data transmission processing method. The method comprises the following steps: acquiring to-be-transmitted third-party payment data; the third-party payment data is partitioned according to the preset length, in the process of transmitting the first data block, the transmission efficiency of each transmission path is evaluated again, and according to the current network state and the influence of the first data block on each transmission path in the transmission process, determining the transmission efficiency of each transmission path; and after the first data block arrives at the receiving end, evaluating the transmission efficiency of the transmission path again, and recombining the data blocks according to the coding sequence. By evaluating the transmission efficiency of the transmission path in real time, the data block can select the optimal transmission path according to the actual transmission efficiency, so that the data block can maintain the transmission sequence in the transmission process and avoid disorder, data backup and waiting are not needed, and the recombination efficiency of the third-party payment data is greatly improved.