The invention provides a small-space suspender-free clamping suspended ceiling. The small-space suspender-free clamping suspended ceiling comprises a partition wall transverse keel, a limiting clamping piece, an n-shaped suspended ceiling plate keel and an F-shaped suspended ceiling plate seam clamping strip, wherein the partition wall transverse keel is installed on a suspended ceiling wall, thelimiting clamping piece is used as a connecting device for connecting the partition wall transverse keel with the n-shaped suspended ceiling plate keel, and the limiting clamping piece is clamped on the partition wall transverse keel, so that the inconvenience in operation in a screw fixing process is avoided; and the F-shaped suspended ceiling plate seam clamping strip is used for fixing a suspended ceiling plate, so that the stability of the suspended ceiling plate is increased, the suspended ceiling plate can adapt to the existence of wind pressure, the suspended ceiling plate cannot shakeor swing, and on the other hand, a gap between the suspended ceiling plate and the wall is sealed by the F-shaped suspended ceiling plate seam clamping strip. The invention further provides a mountingmethod of the small-space suspender-free clamping suspended ceiling. The suspended ceiling structure does not need to be suspended by a suspender, an original floor slab is not damaged, the suspendedceiling space is saved, additionally, the structure is compact, the occupied space is small, the installation steps are few, and the operation is convenient.