Abstract: Mycoplasma pneumonia of pig is one of the most common diseases in the process of pig breeding, once the disease is easy to cause disease in pigs of all ages, and there is a possibility of disease in every season. In this paper, the clinical symptoms and diagnosis of mycoplasma suis pneumonia were analyzed, and the scientific treatment techniques were put forward, so as to achieve effective prevention and treatment and reduce the economic loss of mycoplasma suis pneumonia to pig breeding.