Fertilizer grinding mechanism, water and fertilizer mixing device, and aqueous fertilizer solution preparation production line

A fertilizer grinding mechanism, comprising:

• a fertilizer receiving body, wherein an edge of the fertilizer receiving body is provided with a vertically arranged first channel;
• a connecting body, wherein the connecting body is fixed to a bottom of the fertilizer receiving body and provided with a second channel communicated with the first channel, a bottom of the second channel is communicated with a buffer bin, a pushing block is arranged in the buffer bin, and the pushing block is connected with a drive mechanism for driving the pushing block to move in a radial direction of the connecting body;
• and
• an inner grinding block, wherein the inner grinding block is fixed to a bottom of the connecting body, an outer side of the inner grinding block is provided with a vertically movable grinding roller, the pushing block can push fertilizer falling into the buffer bin to a gap between the inner grinding block and the grinding roller so that the fertilizer is ground under vertical movement of the grinding roller.