The Present invention discloses a built-up microcomputer, comprising an independent input interface integrated with computer main, and output interface integrated with computer main, an output interface as well as a connecting part. One end of the connecting part is hinged to the input interface and the other end is connected to independent input interface integrated with computer main. In the present invention, on the one hand, the independent input interface integrated with computer main can be connected with the input interface to constitute a set of microcomputer, on the other hand, it can also conveniently be separated from the output interface so as to be used independently. Hence, the design of present invention is capable to be combined or separated according to practical requirement, flexible and convenient both for operation and carrying.