Building suspended ceiling decoration construction method

The invention discloses a building suspended ceiling decoration construction method which comprises the following steps: step 1, snapping a line, namely planning a grading position line of a keel on awall top according to a floor elevation horizontal line and a designed elevation; 2, installing main keels are installed, determining the height of the lower end of a hanging rod according to the elevation horizontal line and the keel position line, installing hanging bars, during installation, evenly distributing hanging points, enabling the distance between the keels to range from 1000 mm to 1200 mm, after the hanging bars are installed, and connecting main keel hanging pieces with the hanging bars to complete the installation work of the main keels; and 3, installing auxiliary keels, attaching the auxiliary keels to the bottom faces of the main keels and performing clamping through clamps, fixing edge parts of the auxiliary keels to the wall face through cement nails, wherein the fixeddistance is 300 mm. Pushi