Multi-liquid automatic feeding system

The utility model belongs to the field of plastic granule production, and particularly relates to a multi-liquid automatic feeding system which comprises a plurality of oil additive metering buckets which are respectively provided with a first discharging pipe, a second discharging pipe and a third discharging pipe which are different in thickness. And a quick charging pneumatic valve, a medium-speed charging pneumatic valve and a low-speed charging pneumatic valve are sequentially arranged from coarse to fine. According to the multi-liquid automatic feeding system provided by the utility model, a plurality of liquid additive metering units are formed by arranging a plurality of oil additive metering buckets, and materials discharged from the oil additive metering buckets are weighed by adopting a weight reduction method, so that a plurality of liquid additives can be pre-prepared at the same time; in addition, three discharging pipes with different pipe diameters are arranged at the bottom end of each oil au