The invention discloses a serial number identification method based on network messages. The method solves the problem with low accuracy for the identification of serial numbers through the periodical identification and serial number verification method. The method comprises the following steps: according to the monotonic principle a serial number presents periodically as well as the phenomenon that multiple message formats share a common serial number, conducting periodical division and determination to the data combined by a plurality of sets; and preventing multiple message formats from sharing a common serial number as well as from the influence of data value drifting and losing. The method of the invention can accomplish the rapid identification of serial numbers at high precision and can verify the identified serial numbers by preventing data value drifting and the mixing of a plurality of serial numbers as well as the influence on the serial number identification of the fact that a common serial number is shared by multiple message formats, therefore, ensuring the message classification and finite state machine deduction afterwards.