The invention relates to an all-cotton easy-care shirt processing method. The method includes the steps of tailoring, sewing, atomizing and chemical spraying, wherein finishing liquid is sprayed to a shirt to make the liquid content of the shirt range from 70% to 80%, low-temperature drying, wherein the drying temperature ranges from 55 DEG C to 65 DEG C, and the moisture content of the shirt is made to range from 32% to 38%, low-temperature pressing, wherein the pressure ranges from 5 kg / cm<2> to 6 kg / cm<2>, the temperature ranges from 100 DEG C to 110 DEG C, and the time ranges from 25 seconds to 30 seconds, low-temperature roasting, wherein the shirt is processed at 135 DEG C to 140 DEG C for 4 minutes to 5 minutes, cooling, wherein the shirt is ventilated and cooled for 5 hours in a ventilation room with the humidity ranging from 70% to 80% and finished product packaging. According to the all-cotton easy-care shirt processing method, formaldehyde scavenging agents are added into the finishing liquid to be used for conducting hot pressing processing on the shirt, the easy-care and formaldehyde removal functions of the shirt are achieved in one step, the production cost is reduced, and the production efficiency is improved. The all-cotton easy-care shirt processing method is simple in process, high in operability and suitable for mass production, and processed shirts are comfortable in body feeling and high in air permeability and higher in easy-care performance.