The invention discloses a
raw material mixing device for preparing a fluorescent material for backlight display and a preparation method. The
raw material mixing device comprises a mixing cylinder, a feeding port is formed in the top of the mixing cylinder, an annular supporting frame is further arranged at the top of the mixing cylinder, a plurality of sets of
raw material cylinders are evenly arranged on the
peripheral side of the annular supporting frame, and an annular base is rotationally arranged in the annular supporting frame; a plurality of groups of arc-shaped areas are arranged on the annular base, and a material receiving box is arranged in each group of arc-shaped areas; a discharging port is formed in the bottom of the mixing
barrel, a rotating shaft is rotationally arranged in the mixing
barrel, the bottom end of the rotating shaft extends to the position below the discharging port and is provided with a discharging gear, and an
auger is arranged on the part, located in the discharging port, of the rotating shaft; arc-shaped tooth parts used for being meshed with the discharging gear are arranged at the positions, located in the arc-shaped areas, of the inner ring plate, each arc-shaped
tooth part is composed of multiple sets of
tooth part units, each set of
tooth part units are independently arranged on the inner ring plate in a vertical sliding mode, and a driving
assembly for driving each set of tooth part units to slide is arranged on the annular base; the raw materials can be automatically fed into the mixing cylinder for stirring according to the reverse rotation of the motor in proportion.