The invention provides a cancer patient nutrition management system, and relates to the technical field of cancer nutrition therapies. The system comprises a patient basic information module, a grouping information module, a nutrition evaluation module, a medicine therapy monitoring module, a patient follow-up visit module and a therapy management log module. The system automatically marks patients in a grading mode, and rapid grouping is achieved; a pharmacist carries out nutrition evaluation on the patient every day, and an improved PG-SGA method is adopted for subjective overall evaluationof the patient; and the system records comprehensively-generated nutrition prescription recommendation suggestions according to nutrition evaluation, the nutrition prescription recommendation suggestions are adjusted by pharmacists and then pushed to doctors for checking, and nutrition recommendation prescriptions are obtained after checking of the doctors. The system provided by the invention cansimultaneously realize the functions of automatic grading marking of cancer nutrition treatment patients, online nutrition evaluation, linked checking of nutrition prescriptions by doctors and pharmacists, online communication, regular follow-up visit tables, past treatment file storage and retrieval and the like, saves a lot of time for medical workers, and improves the working efficiency.