The invention discloses a ceiling structure for the top surface of an indoor metal plate wall. The ceiling structure comprises a main keel (2), a dedicated keel connecting piece (3), a Z-shaped keel (4) and a ceiling metal plate (6), wherein the main keel (2) is connected with the Z-shaped keel (4) by the dedicated keel connecting piece (3); a Z-shaped keel folding edge is arranged at the end of the lower part of the Z-shaped keel (4), a small chamfered U-shaped groove folding edge is arranged on one long side of the ceiling metal plate (6), and a large chamfered U-shaped groove folding edge is arranged on the other long side of the ceiling metal plate (6); and when the adjacent ceiling metal plates (6) are spliced, the small chamfered U-shaped groove folding edges of the ceiling metal plates (6) covers the Z-shaped keel folding edge, and the large chamfered U-shaped groove folding edge of the other adjacent ceiling metal plate (6) covers the small chamfered U-shaped groove folding edge. According to the ceiling structure, the production period of a factory can be effectively shortened, the installation efficiency can be improved, and occurrence of safety accidents can be prevented; the height and gap phenomena can be avoided in module construction; and the maintenance in the later-period ceiling is convenient.