Feeding system of cast film production line

The utility model relates to a cast film production line feeding system which comprises a vacuum feeding machine, a powder storage tank, a first air pump, a powder remover, a dust remover and a magnetic bar separator, a suction pipe of the vacuum feeding machine extends into the powder storage tank, and an extraction opening of the vacuum feeding machine is communicated with the first air pump; a powder outlet of the vacuum feeding machine is communicated with a feeding port of the powder remover, an air outlet of the powder remover is communicated with an air inlet of the dust remover, an air outlet of the dust remover is communicated with the air inlet of the powder remover, and a discharging port of the powder remover is communicated with a feeding port of the magnetic bar separator. The powder feeding device has the advantages that when the first air pump works, powder is sucked into the vacuum feeding machine from the powder storage tank through negative pressure, then the powder enters the powder remove