Precise and automatic ultrafine powder feeding device

The invention discloses a precise and automatic ultrafine powder feeding device, which comprises an outer frame, wherein side sealing plates are arranged on the outer walls of the periphery of the outer frame, a top cover is installed at the top of the outer frame, an embedded groove is formed in the front surface of the outer frame, a controller box body is arranged in the embedded groove, a material guide hole is formed in the position, corresponding to the controller box body, of the outer wall of the outer frame, and a PLC is arranged in the controller box body. According to the automatic feeding device, the rotation and the speed of four motors are controlled through a touch screen and programming and logical operation in a PLC respectively, paddles are driven to rotate through a synchronous wheel, and powder in a container tank is subjected to solid-gas mixing, so that the flowability of the powder stirred in the container tank can be enhanced after solid-gas mixing, the agglomeration phenomenon, bridgi