Erythromycin is mainly used to treat tonsillitis caused by streptococci, scarlet fever, lower respiratory tract infection caused by diphtheria and pneumococcal strain, upper respiratory tract infection caused by influenza bacillus, skin and soft tissue infection caused by Staphylococcus aureus. It can also be used to treat acne and purulent skin diseases. The macroporous adsorption resin provided has strong adsorption capacity, long service life, stable physical and chemical properties, good selective separation effect, practicality and low cost, and is often used for purification and separation of organic substances, and the effect of extracting erythromycin is very satisfactory. It has been widely used in the extraction process of erythromycin and has been well received by domestic and foreign customers.