System for extracting sulfur from sulfur-containing foam of coking plant

The utility model relates to a system for extracting sulfur from sulfur-containing foam of a coking plant. The system comprises an extraction unit, a separation unit and a post-treatment unit, whereinthe extraction unit comprises an extraction tower, the extraction tower comprises a tower body and a motor, the tower body sequentially comprises an upper clarification section, a mixing section anda lower clarification section from top to bottom, the upper clarification section is provided with a raffinate phase discharge port, the lower clarification section is provided with an extraction phase discharge port, and the top and the bottom of the mixing section are respectively provided with an extraction agent feed port and a sulfur-containing foam feed port; the separation unit comprises aheat preservation filtering device, and a feeding hole is connected with an extraction phase discharging hole; the post-treatment unit comprises an evaporation crystallizer, a kettle body of the evaporation crystallizer is prov