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 . <EOS>