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This utility model discloses a display screen flatness testing device, relating to the field of display screen testing technology. It includes a base, a movable component on the top of the base, a testing component inside the movable component, and a display screen placed on the top of the base. The testing component includes a motor. The display screen flatness testing device adjusts the height of the connecting piece by rotating a knob on the outer wall of a lead screw, supported by a spring. This facilitates height adjustment of the horizontal probe. During testing, the motor drives a first bevel gear to rotate, which in turn drives a rotating rod via a second bevel gear. The rotating rod, in turn, drives a screw within a fourth bevel gear via a third bevel gear. The screw rotates within a screw groove in a sliding plate, causing the sliding plate to slide along the inner wall of the mounting housing. This moves the mounting housing, which rotates on a movable frame via a rotating shaft. The horizontal probe detects different positions on various areas of the display screen, improving the testing efficiency.