A screen support for an all-in-one smart tablet PC, wherein the screen support is provided with a groove for inserting matching a glass and a slot for inserting a matching infrared touch module , and further provided with a supporting tab ; the supporting tabs of a plurality of screen supports are configured to be joined together end to end to form a screen frame for supporting the screen ; the slot is arranged along the length of the screen support , wherein the groove is located between the supporting tab and the slot , slot walls on both sides of the slot comprise a first slot wall and a second slot wall , the screen support is provided with a recess located below the groove and on one side of the first slot wall , groove walls on both sides of the groove comprise a first groove wall and a second groove wall ; an upper portion of the first slot wall is overlapped with the second groove wall , and the supporting tab is provided on the first groove wall ; an upper end of the second slot wall is provided with a first inclined portion extending toward the first slot wall along the second slot wall ; the first inclined portion is provided with a first fitting recess , and the bottom of the slot is provided with a second fitting recess corresponding to the first fitting recess , the first fitting recess and the second fitting recess are configured to receive two opposite ends of the infrared touch module ; a corner cover and a corner cover seat installed between each two adjacent screen supports , each corner cover seat and each corner cover are provided on two sides thereof with a protrusion configured to be inserted respectively into the recesses of the adjacent two screen supports , each corner cover is installed onto corresponding corner cover seat . joined together end to end to form a screen frame for supporting the screen ; the slot is arranged along the length of the screen support , wherein the groove is located between the supporting tab and the slot , slot walls on both sides of the slot comprise a first slot wall and a second slot wall , the screen support is provided with a recess located below the groove and on one side of the first slot wall , groove walls on both sides of the groove comprise a first groove wall and a second groove wall ; an upper portion of the first slot wall is overlapped with the second groove wall , and the supporting tab is provided on the first groove wall ; an upper end of the second slot wall is provided with a first inclined portion extending toward the first slot wall along the second slot wall ; the first inclined portion is provided with a first fitting recess , and the bottom of the slot is provided with a second fitting recess corresponding to the first fitting recess , the first fitting recess and the second fitting recess are configured to receive two opposite ends of the infrared touch module ; a corner cover and a corner cover seat installed between each two adjacent screen supports , each corner cover seat and each corner cover are provided on two sides thereof with a protrusion configured to be inserted respectively into the recesses of the adjacent two screen supports , each corner cover is installed onto corresponding corner cover seat . <EOS>