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With the reduction of satellite manufacturing and launch costs and the increase in global communication needs, low-orbit Inter-satellite link technology has become a research hotspot. The Inter-satellite link can interconnect multiple satellites to establish an autonomous operating system with navigation and communication functions, reliable communication technology is the current focus of research. In order to adapt to the highly dynamic environment with large Doppler frequency shift in outer space, an integrated inter-satellite link communication transceiver system was designed. The transmitter uses UQPSK direct sequence spread spectrum technology, the dual-channel architecture can simultaneously complete the transmission of navigation and communication data at different rates, and then uses LDPC encoding technology to improve the data transmission rate and stability; The receiving end uses an improved PMF-FFT segmented acquisition algorithm and a normalized minimum sum LDPC decoding algorithm to quickly and accurately capture inter-satellite information. After many tests on the FPGA hardware platform, the system can accurately and quickly capture signals with Doppler frequency shift up to 341KHz in highly dynamic environments. The capture algorithm time can be kept within 200ms, which meets the performance requirements in practical applications.