The utility model provides a spray set for reation kettle is reinforced accurate, is equipped with a spray tube that stretches into in the reation kettle, and the upper end of spray tube meets through the storage tank of hose with dress spray liquid, and the lower extreme of spray tube is equipped with spray liquid distribution chamber, is equipped with in the below in spray liquid distribution chamber and carries out a plurality of shower heads of spraying to the stirring rake in the reation kettle and reation kettle inner wall. Regularly wash the spray set on reation kettle stirring rake and the reation kettle inner wall with the diluent ration, make the raw materials on cauldron wall and the screw clear away. Through this spraying system, make a small amount of polymerization experiment through current reation kettle can be accurate grope each item parameter, improved the accuracy nature of experimental data, improve equipment's utilization ratio. It provides the feasibility to change the experiment on a small quantity for enterprise's miniaturization from now on.