Aiming at the need of irrotational displacement isolator in the application field of marine inertial navigation equipment, a threedimensional translation antishocking platform was proposed based on the resonance peakfree vibration isolators. Due to the lack of horizontal damping of the vibration isolators, lateral and longitudinal dampers were added in the horizontal direction. Based on the antishocking theory, the dynamic model of a threedimensional translation antishocking platform was established. On this basis, according to the shock design conditions, the optimal vibration isolators stiffness and damping parameters were calculated by using ADAMS simulation software. Finally, the vibration test, vertical and lateral shock test were carried out on the antishocking platform prototype. The experimental results show that the vibration transmissibility of the platform is less than 3 and the shock transmissibility is less than 40%.The designed threedimensional translational antishocking platform provides an effective application solutions for inertial navigation equipment.