The utility model discloses a device is prepared in production of pesticide suspending agent, prepare device, second masterbatch preparation device and cut the jar including first masterbatch, first masterbatch prepare the device include the sand mill, with the sand mill pass through receipt jar that the pipeline links to each other and with receive a jar mother liquor tank who links to each other, just receipt jar and a mother liquor tank between still install the pump body. The utility model discloses in first mother liquor need carry on earlier the sand mill carry out the sanding and handlewhen entering into a mother liquor tank, the rethread is received jar to mix and is received, send into a mother liquor tank through the pump body at last in, and the second mother liquor is in orderto reacting in reation kettle earlier in the mixed rethread pump body sends into the 2nd mother liquor tank, and a mother liquor tank and the 2nd mother liquor tank set up on the weighing device, canshear jar mother liquor and carry out accurate ration control entering into among two mother liquor tank.