The utility model provides a production graininess sodium tripolyphosphate's device, including phosphoric acid storage tank, liquid alkaline storing tank, neutralization reaction cauldron, feed pump,filter, neutralizer storage tank, centrifugal pump, dynamic polymerization furnace, depiler valve, screw conveyer, returning charge cylinder, lifting machine, cooling roller, shake sieve, finished product bin soon, its characterized in that: phosphoric acid storage tank, liquid alkaline storing tank are linked together with neutralization reaction cauldron top respectively, and neutralization reaction cauldron bottom links to each other with the feed pump import, and the feed pump export links to each other with the filter import, and the export of filter bottom is linked together with neutralizer storage tank top, and neutralizer storage tank bottom links to each other with the centrifugal pump import, and the centrifugal pump export links to each other with the spray lance. The utility model discloses an it is big that the production of graininess sodium tripolyphosphate product, graininess sodium tripolyphosphate product have an apparent density, and the advantage such as be difficult for when dissolving hardening.