The invention relates to a plaster board ceiling module assembling method. The plaster board ceiling module assembling method comprises the following steps: connecting a plurality of first C-shaped keels with a U-shaped keel to form a keel framework; after connection, fixing the keel framework to a surface of a plaster board; enabling second C-shaped keels to be perpendicular to the first C-shapedkeels and connecting the second C-shaped keels with one ends of the first C-shaped keels; and inerting edge hanging pieces to the other ends of the first C-shaped keels. By factory processing and batched production, the problem that in traditional construction, construction quality caused by construction level is uneven is solved, and meanwhile, construction processes and environmental pollutionsuch as field noises are reduced.