Powder precise valve device and control method thereof

The invention relates to a powder precise valve device and a control method, the device comprises a mounting main plate, a powder bin and a powder feeding hopper, the powder bin is fixedly arranged on one side of the mounting main plate, and the powder feeding hopper is communicated with the powder bin; a powder throwing rotating shaft is arranged in the powder bin, an upper wear-resisting ring is arranged at the bottom of the powder bin, the bottom of the powder throwing rotating shaft penetrates through the upper wear-resisting ring and then is fixedly provided with a lower blocking wafer, and a gap between the upper wear-resisting ring and the lower blocking wafer forms a powder outlet; a first driving mechanism used for driving the powder throwing rotating shaft to rotate is arranged on one side of the top of the mounting main plate, and a second driving mechanism used for driving the first driving mechanism to move up and down along the mounting main plate so as to drive the lower blocking wafer at the b