This article briefly introduces the engineering background of the voltage characteristics test of boat-borne batteries. Based on the existing test conditions, a hardware test structure is established. A real-time monitoring system is designed through the VISA module of LabVIEW, which can realize remote real-time monitoring, storage, and the display of battery voltage test curve. It provides an efficient test method for grasping the characteristics of the boat-borne batteries and has certain reference value for real-time monitoring of other instruments.