The present invention relates to the technical field of electronic products, and provides a smart tablet computer having expandable peripheral accessories, and a usage method thereof, comprising: a tablet computer, a touch display screen, a touch button, and a rear shell being provided on the tablet computer, a distance sensor and a light sensor being arranged on the tablet computer; a pressure sensing component is built into the bottom of the touch button, a touch feedback linear motor being arranged at the side of the touch button; the back surface of the rear shell is provided with a protrusion, a connection contact point, a locking structure, and a positioning point being arranged on the protrusion, the connection contact point being used for charging and data communication. By means of using pressure, distance, light, and magnetic sensing technology in a tablet computer, the present invention solves the problem of false touches experienced by existing tablet computers on the market, and provides tactile feedback to the user by means of a vibrating motor, prompting the user of the execution results of the functions of the touch button, and can provide prompts that the distance of the user from the tablet computer is too close or the brightness of the tablet computer is unsuitable, effectively protecting the sight of the user.