Efficient crystallization and purification device and crystallization method for inorganic salt

The invention discloses an inorganic salt efficient crystallization and purification device which comprises a base frame, a crystallization tank, a liquid inlet, an additive box, a liquid conveying pipe, a spray head, a stirring and scraping device, heating equipment and a circulating extraction device, the crystallization tank is arranged on the base frame, the liquid inlet is formed in the upper end of the crystallization tank, the additive box is arranged on the side wall of the crystallization tank, and the liquid conveying pipe is arranged on the side wall of the crystallization tank. The liquid conveying pipe is communicated with the additive box and is positioned in the crystallizing tank, the spray head is arranged on the liquid conveying pipe, the stirring and scraping device is rotationally arranged in the crystallizing tank, the heating equipment is arranged in the inner wall of the crystallizing tank, and the circulating extraction device is arranged on the base frame and is communicated with the