An all-in-one smart tablet PC and the assembly method thereof are disclosed. The all-in-one smart tablet PC includes: a screen, a glass, an infrared touch module, a rear shell and a plurality of screen supports; each of the screen supports is provided with a groove, with the glass inserted into the groove and matching the groove; each of the screen supports is further provided with a slot, with the infrared touch module positioned into the slot and matching the slot; a supporting tab is provided on a side of the screen support, and a screen frame is formed by the supporting tabs of the screen supports joined together end to end; the screen is installed within the screen frame and the rear shell is installed onto the back of the screen. By the technical solution of the present disclosure, the quality and the qualified rate of the product are improved; meanwhile, no positioning blocks are used during the whole assembly process, which saves cost and improves the assembly efficiency, and is able to meet the requirements for large-scale and modular production.
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