Simple direct current-alternating current alarm device

The utility model relates to a simple direct current and alternating current serial alarm device which comprises an alarm device body, the alarm device body comprises a shell, a measuring meter and an alarm device, the measuring meter and the alarm device are arranged in the shell, and the measuring meter and the alarm device are connected through a wire. Wherein the measuring meter is installed in an installation groove formed in the side body of the shell and partially exposed out of the shell, the exposed part is provided with a control panel with a display screen and function keys, the display screen is used for displaying the current and voltage conditions of the detection circuit, and the function keys are composed of an adjusting key, a determining key and a setting key. The adjusting module is used for adjusting a set value of the measuring meter; and one side, far away from the control panel, of the measuring meter is connected with an alarm device arranged on the side wall of the shell through a wir