Provided is a curved surface adjustment device comprising an angle rotating assembly and a locking assembly, wherein the angle rotating assembly comprises a middle plate and a housing, the housing comprises a first mounting portion and a receptacle, the middle plate comprises a second mounting portion and an arc-shaped sliding portion; the locking assembly comprises a locking mechanism, when the locking mechanism is in a locking state, the arc-shaped sliding portion is locked in the arc-shaped sliding groove of the receptacle, when in an unlocking state, the arc-shaped sliding portion slides relative to the arc-shaped sliding groove of the receptacle, to adjust the included angle between the first mounting portion and the second mounting portion, thereby adjusting the curved surface radian of the LED display screen. The LED display screen adjusted by the present invention has better curved surface smoothness and smaller curved surface radius, provides more excellent display effect.