A battery safety monitoring method, applicable to a terminal device, terminal device comprising video software and game software, the method comprising: obtaining a battery voltage of a battery of the terminal device in real time; determining whether a magnitude of voltage drop of the battery voltage within a preset time period is greater than or equal to a preset value according to the battery voltage obtained in real time; and determining that the battery is abnormal currently, when the magnitude of voltage drop of the battery voltage within the preset time period is greater than or equal to the preset value; being characterized by: determining a fault grade according to the magnitude of voltage drop of the battery voltage within the preset time period, and limiting a corresponding function of the terminal device according to the fault grade, in which, the fault grade comprises a general grade, a comparatively severe grade, a severe grade, or a complete fault grade; in which, when the fault grade is the general grade, video software and game software in the terminal device is disabled; when the fault grade is the comparatively severe grade or the severe grade, an entire system of the terminal device is prohibited; when the fault grade is the complete fault grade, the battery fails, the system of the terminal device is off and cannot be started. obtaining a battery voltage of a battery of the terminal device in real time; determining whether a magnitude of voltage drop of the battery voltage within a preset time period is greater than or equal to a preset value according to the battery voltage obtained in real time; and determining that the battery is abnormal currently, when the magnitude of voltage drop of the battery voltage within the preset time period is greater than or equal to the preset value; being characterized by: determining a fault grade according to the magnitude of voltage drop of the battery voltage within the preset time period, and limiting a corresponding function of the terminal device according to the fault grade, in which, the fault grade comprises a general grade, a comparatively severe grade, a severe grade, or a complete fault grade; in which, when the fault grade is the general grade, video software and game software in the terminal device is disabled; when the fault grade is the comparatively severe grade or the severe grade, an entire system of the terminal device is prohibited; when the fault grade is the complete fault grade, the battery fails, the system of the terminal device is off and cannot be started. determining a fault grade according to the magnitude of voltage drop of the battery voltage within the preset time period, and limiting a corresponding function of the terminal device according to the fault grade, in which, the fault grade comprises a general grade, a comparatively severe grade, a severe grade, or a complete fault grade; in which, when the fault grade is the general grade, video software and game software in the terminal device is disabled; when the fault grade is the comparatively severe grade or the severe grade, an entire system of the terminal device is prohibited; when the fault grade is the complete fault grade, the battery fails, the system of the terminal device is off and cannot be started.