Evaporative crystallization device

The utility model relates to an evaporative crystallization device which comprises an evaporation box, the evaporation box is used for carrying out evaporative crystallization on reaction liquid, a heating mechanism for heating the reaction liquid is arranged on the outer side of the evaporation box, and heat exchange mechanisms for recovering high-temperature steam are symmetrically arranged at the tops of the two sides of the evaporation box; the heat exchange mechanism comprises an exchange box fixedly arranged on the evaporation box, an exchange pipe is arranged in the middle of the exchange box, an air inlet is fixedly formed in the bottom of the exchange pipe, an air outlet is fixedly formed in the top of the exchange pipe, and a condensation pipe is fixedly arranged on the outer surface of the exchange pipe. The condensation pipe is spirally wound on the outer side of the exchange pipe; the problems that in the prior art, the evaporative crystallization efficiency is improved through synchronous rotati