Material vacuumizing device and vacuumizing method applied to material vacuumizing device

The invention discloses a material vacuumizing device and a vacuumizing method applied to the material vacuumizing device. The material vacuumizing device comprises a material tank and a vacuumizing assembly. The material tank is provided with a feeding structure and a vacuumizing end. The vacuumizing assembly comprises a vacuumizing pipeline, a vacuumizing valve set and a vacuum pump. The vacuumizing pipeline is connected with the vacuumizing end, the vacuum pump is connected with the vacuumizing pipeline and can vacuumize the material tank through the vacuumizing pipeline, the vacuumizing valve set comprises two vacuumizing valves with the controlled flow speeds sequentially arranged from small to large, and the vacuumizing valve set is arranged on the vacuumizing pipeline and between the vacuum pump and the vacuumizing end. The pump-out valves are connected in parallel and then connected with the vacuum pump in series, and any pump-out valve can be opened and closed independently. According to the material