The invention discloses a micro smart device for keyboard switching, which comprises a keyboard interface module, a host interface module, an operating system module, a USB security configuration module, and a keyboard mapping switching module. The keyboard interface module is configured to connect a keyboard and receive keyboard input information. The operating system module runs an independent operating system. The USB security configuration module is configured to configure and generate a personalized keyboard corresponding relationship configuration file on a terminal installed with special bundled software. The keyboard mapping switching module is configured to switch a standard keyboard to a special combination keyboard. The host interface module is configured to input information input via the switched keyboard into a hose. The micro smart device for keyboard switching can avoid important information such as a password entered via the keyboard from being peeped, heard or photographed to cause leakage of such important information as the password, and also can reduce the burden of password memory.