The invention discloses a mounting structure for a curved-surface hanger plate on a wall top surface. The mounting structure comprises a first keel unit, a second keel unit and a connector, wherein the first keel unit is vertically arranged; the top end of the first keel unit is fixedly connected with the wall top surface; a plurality of first waist-shaped holes are formed in the first keel unit; the second keel unit is transversely arranged; a plurality of second waist-shaped holes are formed in the second keel unit; the bottom end of the first keel unit is in screw joint in the second waist-shaped holes; the curved-surface hanger plate is hung below the second keel unit; the connector is in screw joint in the first waist holes for being arranged at the top end and/or the bottom end of the first keel unit in a sleeving mode; when the connector is arranged at the top end of the first keel unit, the first keel unit is fixedly connected with the wall top surface through the connector; and when the connector is arranged at the bottom end of the first keel unit, the first keel unit is connected with the second keel unit by virtue of the connector. Compared with the prior art, the e mounting structure can effectively solve the problem that plate blocks are difficult to align and have diagonalization errors.