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At present, in military tactical Internet wireless communication systems, ultra-shortwave / shortwave and multi-band radios provide a non-standard K interface for user data access. In the design of all kinds of communication control devices, in order to realize the voice and IP business data to wirelessly access the tactical Internet[1], it is required to design a K-port communication unit to interact with various types of radio stations for data interaction. In order to solve this problem, a K-port communication module based on FPGA and MT9172 is designed. The FPGA mainly implements the link layer function of the K interface, achieves data access through the TDM port, multiplexes, buffers and sends voice and service data according to time slots, Realize synchronization and ring signaling handshake between stations. The MT9172 mainly implements the K interface physical layer functions and provides a serial data interface for the FPGA. Design and implementation of the field network interface standard defined K-mouth mode of operation 3, the transfer rate of 128kbps, completed TDM port to K port interface conversion. It is verified that the K-port communication module can be reliably applied to various communication control devices that need to access the tactical Internet.