The invention discloses a dynamically changed transmission message processing method and a dynamically changed transmission message processing device, for solving the problem that the characteristic flow classification mode adopted by existing message order preservation cannot be dynamically changed. The method includes the steps of: firstly receiving a message to be processed, then judging whether the type of the message is a message of which the order needs to be preserved, and at last when determining that the message is the message of which the order needs to be preserved, obtaining the business flow identifier of the message; based on three characteristic flow algorithm preset by the system, the optimal characteristic flow algorithm is selected according to a network congestion degree to generate a business flow dispatching mode when the network is in congestion state, and the message is processed based on the business flow dispatching mode, so that the characteristic flow classification algorithm can be dynamically changed according to different networking and device forms by prefabricating several characteristic flow classification algorithms, the cost is small, and the operability is strong.