The invention relates to a weighing and cotton-pushing device of the packer noil, comprising a cotton-feeding bucket (1), a measuring bucket (2), a V shaped connecting bucket (3) and a cotton-pushing device. The fiber firstly falls into the measuring bucket (2) from the cotton-feeding bucket (1), after weighing falls into the cotton-pushing device through the V shaped connecting bucket (3), and finally drops into a compression box (19). The cotton-feeding bucket is divided into two branch cavities, and a guiding turning plate (9) controls to switch on the branch cavities, measuring buckets are respectively arranged under each branch cavity, and a noil port is arranged above the cavity B (8), at least a branch cavity is provided with a flow control turning plate (11) and a cotton-delivering roller (10). The weighing and cotton-pushing device of the packer noil has the advantages that the measuring bucket can weigh exactly under the static state, meanwhile guaranteeing the efficiency ofcotton feeding, and the bag number with the precision of the bag weight up to 350kg plus or minus 0.5kg (160 tons production line of daily capacity) amounts to above 95 percents of the total bag number, meanwhile the travel of the pre-pressure cylinder is shortened.