Inter-satellite laser interferometry enables nanometer- and even picometer-level long-base line displacement measurements, with significant application value in fields such as satellite navigation, lase reommunication ,Earth’s gravity field measurement , and space-based gravitational wave detection. The primary technical challenges of long-baseline laser interferometric links include weak light reception , beam pointing acquisition , and Doppler shift, Based on the principle of heterodyne laser interferometry , this paper designs abidircetional laser interfer ometrie link experiment to simulate long-baseline displacement and laser pointing angle measurements between satellite platforms, The device achieves real-time precision measurement of inter-satellite distance and pointing angle changes by measuring the interference phase shift between the received laser from the remote satellite and the loeal reference laser. This experimental system is suitable forunder graduate physics teaching, encompassing multiple disciplines such as opties , electronics , kinematics , and metrology.lt helps students develop skills in optical system design, experimental apparatus setup, error analysis ,and data processing while deepening their understanding of laser interferometry principles and its applications in deep-space exploration.