Upgrading device for byproduct hydrochloric acid of sulfur-based compound fertilizer

The utility model discloses an upgrading device for sulfur-based compound fertilizer byproduct hydrochloric acid, and belongs to the technical field of sulfur-based compound fertilizer production. The device comprises a crude hydrochloric acid storage tank, a falling film absorption tower, a desalted water preparation structure, a fine hydrochloric acid storage tank, a graphite condenser, a waste hydrochloric acid storage tank, a bag filter, a P300 decolorizing resin column and a DM825 decolorizing resin column, the crude hydrochloric acid storage tank is connected with an acid liquid outlet of the falling film absorption tower, and the desalted water preparation structure is connected with the falling film absorption tower; a tail gas outlet of a reaction kettle for producing the sulfenyl compound fertilizer, a graphite condenser and a falling film absorption tower are sequentially connected, a condensate outlet of the graphite condenser is connected with a refined hydrochloric acid storage tank, and a crude