The invention discloses a multi-dimensional speed increasing space-saving human-computer interaction method, a human-computer interaction device and an electronic device for an intelligent platform. The human-computer interaction device comprises a key input device and a mouse simulator for achieving mouse functions, the area of the mouse simulator and the area of the key input device are at least partially overlapped and can include areas among input keys, the same space can serve as a keyboard and a mouse, and input operation and information can be intelligently switched and identified. In the input process, a front arm does not need to frequently move in use, parallel input is realized, and efficiency is improved. Besides, the human-computer interaction device is applied to the electronic device, human-computer interaction is more convenient, and more display space is available, or the display space can be more sufficiently used.