Aiming at the problem of the low rescue efficiency caused by the poor wave adaptability of small catamaran rescue craft, a hydraulic interconnected suspension used for ship vibration reduction was proposed. Based on the principle of dual-cylinder hydraulic interconnection, simulation analysis and validation of the suspension system were conducted. The AMESim platform was used to simulate and analyze the vibration reduction characteristics and mechanism of the suspension system. Based on a dual-cylinder interconnected test device, interconnection vibration reduction tests were completed for excitation shocks of different amplitudes and frequencies. Results show that the hydraulic interconnected suspension system can achieve vibration reduction effect, and the vertical displacement compensation ability of the suspension system is about 45%. In addition, the  acceleration characteristics of the system are more sensitive to low-frequency impact responses. The results can provide a basis for the production of small rescue boat test prototype.