The present disclosure discloses a smart wearable device and an information input method thereof. The smart wearable device comprises a secondary touch panel located on at least one side, and a primary screen touch panel located on a front side; when the smart wearable device is in an input state, the secondary touch panel and the primary screen touch panel respectively receive touch instructions; a touch chip detects the primary screen touch panel and the secondary touch panel, obtains touch instructions, processes them and then outputs them; a microcontroller unit sets a first mapping relationship between an event of switching controls in each layer of an input method application and the touch instruction of the secondary touch panel, sets a second mapping relationship between an event of switching different layers, an input confirmation touch event, an input deletion touch event and the touch instruction of the primary screen touch panel, and implements information input based on the first mapping relationship, the second mapping relationship, and the touch instructions. With the secondary touch panel being in cooperation with the primary screen touch panel, the technical solution makes information input more convenient and quicker, and solves the problem about undesirable user experience upon information input on a small-sized smart wearable device.