Feeding device with anti-overflow function for microbial culture and using method thereof

The invention discloses a feeding device with an anti-overflow function for microbial culture and a using method thereof. The feeding device comprises a bottom plate, a preparation barrel is fixedly arranged in the middle of the top surface of the bottom plate, an opening is formed in the top of the preparation barrel, a screw groove is formed in the position, close to the top, of an inner cavity of the preparation barrel, and a thick pipe is fixedly connected to the top of the preparation barrel; the thick pipe communicates with the preparation barrel, a top plate is arranged above the thick pipe, an outer eave is fixedly connected to the position, close to the top, of the outer wall of the preparation barrel, four supporting rods distributed in an annular array mode are fixedly connected to the top of the outer eave, and the top ends of the supporting rods are fixedly connected with the bottom of the top plate; a round pipe is movably connected to the center of the top of the top plate through a bearing, th