Multistage wet grinding device for suspended fertilizer

The invention discloses a suspension fertilizer multi-stage wet grinding device which comprises two sets of grinding mechanisms, each grinding mechanism comprises a workbench and a grinding cylinder, a feeding pipe is arranged at the top of each grinding cylinder, a discharging pipe is arranged at the bottom of each grinding cylinder, and the discharging pipe of one set of grinding cylinders is connected with the feeding pipe of the other set of grinding cylinders through a guiding pipe; a shell is arranged at the upper end of the workbench, the grinding cylinder is fixedly connected to one side of the shell, a grinding assembly is arranged in the grinding cylinder and comprises an inner cylinder, a rotating shaft is rotationally arranged in the inner cylinder, a plurality of sets of grinding discs are fixedly connected to the rotating shaft, and a set of annular grooves is formed in the position, corresponding to each set of grinding disc, of the inner cylinder; according to the device, raw materials are pus