Disposable water-soluble flame retardant containing nitrogen and phosphorus, used for flame retardant treatment of leather and textile fabrics.Disposable water-soluble flame retardant containing nitrogen and phosphorus, used for flame retardant treatment of leather and textile fabrics.Disposable water-soluble flame retardant containing nitrogen and phosphorus, used for flame retardant treatment of leather and textile fabrics.Disposable water-soluble flame retardant containing nitrogen and phosphorus, used for flame retardant treatment of leather and textile fabrics.