Extrusion type fertilizer granulator

The extrusion type fertilizer granulator comprises a hopper, a limiting sleeve, a charging barrel, a motor, a shell, a discharging plate and a rotating shaft, the charging barrel is welded to an opening in the lower end of the hopper, through holes which are evenly distributed are formed in the outer wall of the charging barrel, the limiting sleeve is welded to the outer wall of the upper end of the charging barrel, and the limiting ring is rotationally installed in the limiting sleeve; cutter bars distributed in a circular array mode are fixed to the lower surface of the limiting ring, a fixing plate is arranged on the lower surface of the charging barrel, a motor is arranged at the bottom end of the shell, a rotating shaft is arranged at the upper end of the motor, a discharging plate isarranged between the motor and the charging barrel, and the rotating shaft sequentially penetrates through the discharging plate, the fixing plate and the charging barrel. And the outer wall of the end, located on the chargi