The invention discloses a novel full-automatic down filling machine. The down filling machine comprises a fan, a down storage box, a weighing device and a down filling pipe, wherein the down filling pipe comprises an inner pipe, an outer pipe and a long pipe, a through down incoming hole is formed in the middle of the inner pipe, two steps are arranged at the front end of the inner pipe, a step is arranged at the rear end inside the outer pipe, the step at the rear end inside the outer pipe is in lap joint with the first step at the front end of the inner pipe in a sealing mode, an annular cavity is formed by the step at the rear end inside the outer pipe and the second step at the front end of the inner pipe, a gas inlet which is communicated with the annular cavity is arranged on one side of the outer pipe, a plurality of gas outgoing grooves which are communicated with the annular cavity are uniformly formed in the front end of the inner pipe and are formed in an inclined mode in the clockwise or anticlockwise direction, and the long pipe is connected with the front end of the outer pipe in a sealing mode. Compared with the prior art, the down filling machine has the advantages of being simple in structure, convenient to operate, high in working efficiency, low in energy consumption, low in labor intensity, uniform in down filling and high in down filling quality.