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; an arc-shaped sliding groove is formed in the receptacle; the middle plate comprises a second mounting portion and an arc-shaped sliding portion; the second mounting portion is positioned outside the arc-shaped sliding groove; the arc-shaped sliding portion is slideable and positioned in arc-shaped sliding groove; characterized in that the first mounting portion and the second mounting portion are positioned at two sides of the arc-shaped sliding groove; the receptacle comprises a cover plate and a bottom plate, the arc-shaped sliding groove is arranged on the bottom plate, and the cover plate is fixedly connected to the bottom plate and covers the arc-shaped sliding groove; the locking assembly comprises a locking mechanism, the locking mechanism comprises a thread component, a top bar, a bushing and a locking piece, and the bushing is fixedly connected to the bottom plate; the bushing is provided with a through hole extending along the axial direction of the bushing, the bottom plate is provided with a locking hole axially penetrating the through hole, and the locking piece is positioned in the locking hole; the top bar is slidably connected in the through hole, one end of the top bar is provided with a threaded hole, one end of the thread component is threadedly connected in the threaded hole, and the other end of the top bar is abutted against the locking piece; rotating the thread component can slide the top bar along the through hole, so that the locking piece locks the arc-shaped sliding portion; and the locking mechanism has a locking state and an unlocking state, when the locking mechanism is in a locking state, the arc-shaped sliding portion is locked in the arc-shaped sliding groove, and when the locking mechanism is in an unlocking state, the arc-shaped sliding portion can slide relative to the arc-shaped sliding groove, so as to adjust the included angle between the first mounting portion and the second mounting portion. characterized in that the first mounting portion and the second mounting portion are positioned at two sides of the arc-shaped sliding groove; the receptacle comprises a cover plate and a bottom plate, the arc-shaped sliding groove is arranged on the bottom plate, and the cover plate is fixedly connected to the bottom plate and covers the arc-shaped sliding groove; the locking assembly comprises a locking mechanism, the locking mechanism comprises a thread component, a top bar, a bushing and a locking piece, and the bushing is fixedly connected to the bottom plate; the bushing is provided with a through hole extending along the axial direction of the bushing, the bottom plate is provided with a locking hole axially penetrating the through hole, and the locking piece is positioned in the locking hole; the top bar is slidably connected in the through hole, one end of the top bar is provided with a threaded hole, one end of the thread component is threadedly connected in the threaded hole, and the other end of the top bar is abutted against the locking piece; rotating the thread component can slide the top bar along the through hole, so that the locking piece locks the arc-shaped sliding portion; and the locking mechanism has a locking state and an unlocking state, when the locking mechanism is in a locking state, the arc-shaped sliding portion is locked in the arc-shaped sliding groove, and when the locking mechanism is in an unlocking state, the arc-shaped sliding portion can slide relative to the arc-shaped sliding groove, so as to adjust the included angle between the first mounting portion and the second mounting portion.