The utility model discloses an alarm device for monitoring separation of a storage battery from a bus. The device comprises a device shell, a dot matrix liquid crystal touch display screen and an emergency automatic power-off device, the device shell is located on the outermost periphery of the device, the dot matrix liquid crystal touch display screen is arranged on the outer surface of the device shell, the information mainboard is arranged in the device shell, the main control chip is arranged on the upper left portion of the AD converter, and the emergency automatic power-off device is arranged on the lower left portion in the device shell. According to the utility model, through the lattice liquid crystal touch control display screen, an analysis result of a bus disengagement fault can be conveniently and visually observed and judged; related operation can be conveniently executed, the switching value state acquisition element is convenient for monitoring the operation state of each lead at the storage battery switch; the storage battery pack voltage acquisition element can conveniently and effectively monitor the operation states of the voltage division circuit, the optical coupler isolation circuit and the filter circuit and the bus connection state, and the storage battery floating charge current acquisition element can conveniently and effectively monitor the bus at the floating charge current sensor.