Oxalic acid is mainly used as reducing agent and bleaching agent.

In producing antibiotics, borneol and other drugs.

In producing cobalt-molybdenum-aluminum catalyst.

In metal surface cleaning and handling, extraction of rare earth element, leather processing, textile printing and dyeing, catalyst preparation, and etc.

In producing hydroquinone, pentaerythritol, cobalt oxalate, nickel oxalate, gallic acid, and other chemical products in organic synthesis industry.

In producing PVC, amino plastic and paint in plastic industry.

In producing basic green in dyeing industry.

As dyeing auxiliary and bleaching agent in dyieng industry.

In producing aureomycin, oxytetracycline, tetracycline, streptomycin and ephedrine in pharmaceutical industry.

Moreover, oxalic acid can also be used in the synthesis of oxalate, oxalate, oxamide, and other products.