The invention relates to an automatic quantitative down-filling 
machine, which comprises a rack, a table surface, a balance, a down tube, a tube cover, an 
elbow, a hose, a down-filling gun and an 
automatic control device. The down-filling gun consists of a connecting 
pipe, an air 
amplifier, an air 
amplifier fixing cover, a down-filling 
pipe and a down-filling gun 
handle, the 
automatic control device comprises a down-filling switch, a weighing sensor, a single-
chip microcomputer and a 
solenoid valve; the balance is arranged on the table surface, the down tube is supported on the balance by a bracket and is provided with a down-adding port, the hose is connected with the tube cover through the 
elbow, an 
elbow clamping block is fixed on a crossbeam, the down-filling gun is connected with the hose through the connecting 
pipe, the down-filling switch is arranged on the down-filling gun 
handle, an air intake pipe connector is connected with the air 
amplifier in the down-filling gun, and an air intake pipe penetrates through a hole on the down-filling gun 
handle and is connected with the air intake pipe connector. The invention has the advantages that the quantitative weighing and pneumatic filling of down are realized with the 
automatic control technology, the down-filing amount can be arbitrarily set, the filling efficiency is high, the 
working environment is good, and the down waste and damage can be reduced.