Pneumatic vacuum feeding machine conveys materials by using the high vacuum produced when the compressed air goes through the vacuum generator. It does not require mechanical vacuum pump. It has the favorable features of a simple structure, small size, maintenance-free, low noise, convenient control and elimination of materials static and in accordance with the GMP requirements, etc. Vacuum generator generates high vacuum in order to avoid the stratification of the conveyed materials and ensure the homogeneity of the mixed materials. It is the first choice to automatically load materials to equipment such as tablet press, capsule filling machine, dry type granulator, packing machine, grinder, vibrating sifter, etc.