NOVELTY - System to recycle waste sulfuric acid to form compound fertilizer, comprises: waste sulfuric acid overhead tank (3) connected to waste sulfuric acid storage tank (1), via opening connected by pipeline and waste sulfuric acid high position groove, sulfuric acid of overhead tank opening is connected to concentrated phosphoric acid storage tank (2) feeding opening, sulfuric acid overhead tank and concentrated phosphoric acid storage tank are provided with flow rate meter (5), and concentrated phosphoric acid storage tank and neutralization reaction tank (6) are connected by opening via pipeline.    USE - As production system for recycling waste sulfuric acid to form compound fertilizer (claimed).    ADVANTAGE - The production system for recycling waste sulfuric acid to form compound fertilizer solves problem that current technology cannot effectively utilize waste sulfuric acid by recycling. In the preparation of fertilizer waste sulfuric acid is effectively recycled, avoids pollution to environment, and at same time treatment does not require too much money for device, and saves cost.    DETAILED DESCRIPTION - Production system for recycling waste sulfuric acid to form compound fertilizer, comprises: waste sulfuric acid storage tank (1), waste sulfuric acid overhead tank (3), concentrated phosphoric acid storage tank (2) and neutralization reaction tank (6); where waste sulfuric acid overhead tank is connected on upper part of waste sulfuric acid storage tank, via opening connected by pipeline and waste sulfuric acid high position groove, opening is provided with pump (4) on upper part of pipeline, sulfuric acid of overhead tank opening acid is connected to concentrated phosphoric acid storage tank feeding opening, waste sulfuric acid overhead tank and concentrated phosphoric acid storage tank are provided with flow rate meter (5) having control valve (7), and concentrated phosphoric acid storage tank and neutralization reaction tank are connected by opening through pipeline. An INDEPENDENT CLAIM is included method for implementing the production system for recycling waste sulfuric acid to form compound fertilizer, involving: adding waste sulfuric acid in waste sulfuric acid storage tank by pressing pump into waste sulfuric acid overhead tank, adding phosphoric acid to concentrated phosphoric acid storage tank, opening control valve, passing waste sulfuric acid of waste sulfuric acid overhead tank to concentrated phosphoric acid storage tank through pipeline to mix waste sulfuric acid and phosphoric acid, passing obtained mixed acid to neutralization reaction tank through pipeline, at same time introducing ammonia to neutralization reaction tank so that ammonia, phosphoric acid and sulfuric acid react to obtain fertilizer slurry, granulating obtained fertilizer slurry, drying, sieving and cooling.    DESCRIPTION OF DRAWING(S) - The figure shows production system for recycling waste sulfuric acid to form compound fertilizer.    Waste sulfuric acid storage tank (1)    Concentrated phosphoric acid storage tank (2)    Waste sulfuric acid overhead tank (3)    Pump (4)    Flow rate meter (5)    Neutralization reaction tank (6)    Control valve (7)