The invention discloses a data processing method and a data processing device. The data processing method includes determining a time point when new data of a comparison queue currently enters a compassion channel, taking the time point of entrance of the new data as a starting time point of a time window, checking the state of the comparison channel corresponding to the time window and the state of all rest data, participating in the comparison channel, in the comparison queue, and if the states are all normal, labeling the new data. The comparison channel refers to a main channel or any a spare channel. The time window refers to a preset time period before the starting time point. By the data processing method and the data processing device, abnormity of transmitted data in the main and the spare channels is found in time, so that reliability of the transmitted data during power dispatching is improved, and further, power grid communication quality is improved.