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.