Abstract: Once the channel bandwidth is determined by traditional channelization, the polyphase number of the filter decomposition and the time domain resolution after the channelization are also determined, and the coupling is strong, which leads to the lack of flexibility in the use of channelization technology in practical engineering. Firstly, a mathematical model of real signal digital channelization based on polyphase filter is presented. Then, a general digital channelized mathematical formula is derived. Finally, the correctness of the general digital channelization technology is verified by simulation. The general digital channelization technology proposed in this paper can effectively decouple channel bandwidth and polyphase number of filter, and the time domain resolution after channelization. It increases the convenience of the system design and the application of channelization technology.