The application discloses a prefabricated corner structure, which comprises a corner module, the corner module comprises a stand column (1) and corner support beams (2) arranged at two ends of the stand column (1) respectively, the corner support beams (2) are respectively provided with fixing pieces (4), the fixing pieces (4) are provided with first strip-shaped adjusting holes, external corner pieces (3) are provided with adjusting pieces (5) at two ends respectively, the adjusting pieces (5) are provided with second strip-shaped adjusting holes, the first strip-shaped adjusting holes and the second strip-shaped adjusting holes are one-to-one corresponding and matched, and the first strip-shaped adjusting holes and the second strip-shaped adjusting holes have an included angle greater than 0° in the same horizontal plane when matched, the relative positions of the fixing pieces and the corresponding adjusting pieces can be adjusted through the design of the strip-shaped holes, the relative positions of the corner support beams and the external corner pieces can be adjusted, and the angle of the outer side surface of the external corner piece can be adjusted. The whole can be connected through screws, 100%
prefabrication and more than 95% recycling can be realized.