Backflushing type vacuum feeding machine

According to the back-flushing type vacuum feeding machine, a rack, a control box, a back-flushing device, a powder dust collecting device and a draught fan are arranged, the interior of a cyclone hopper body of the back-flushing feeding machine in the back-flushing device is hollow, a dust filtering device for filtering dust is installed in the cyclone hopper body, and it can be guaranteed that air entering the draught fan is relatively clean after filtering is conducted; the cyclone hopper body of the backflushing feeding machine is provided with the air inlet and is connected with the fan through the air inlet, so that the interior of the material suction component can be pumped into a negative pressure state, the fan generates enough negative pressure, stable operation of equipment is guaranteed, various electric appliance accessories are arranged in the control box, and intelligent control over equipment operation is achieved; the dust collecting cloth bag and the dust receiving hopper of the powder coll