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Autonomous underwater vehicle (AUV) plays a vitally crucial role in ocean exploration and development, and as one of the key technology, its safety is the important part of research that determines whether the AUV can accomplish the underwater mission and return back safely. In order to further enhance its ability of dealing difficulty and dangerous situation when AUV maneuvers under the water, a renew safety jettison system is designed. In this system, the main controller unit of security guarantee computer utilizes the ARM Cortex-M4 processor, and establish the security jettison circuit of AUV, which can response the jettison command that set previously and trigger the jettison motion automatically according to emergent situation, such as: the control system powered off, system halted, water leakage. Finally, through simulation and trial, the reliability and feasibility of the designed safety jettison system verified, which can guarantee the safety of AUV when maneuvers under the water .