Objective: To study the application effect of early postoperative enteral nutrition in the nursing care of elderly patients with gastric cancer. Methods: Sixty elderly patients with gastric cancer admitted to the hospital from January 2022 to January 2024 were selected and divided into groups according to the random number table method. The control group (n = 30) received routine nursing after surgery, while the observation group (n = 30) received early enteral nutrition nursing after surgery. The perioperative indexes, nutritional indexes before and after nursing, humoral and cellular immune indexes before and after nursing, gastrointestinal hormone levels before and after nursing, and the incidence of postoperative complications were compared between the two groups. Results: The perioperative indexes of the observation group were better than those of the control group (P < 0.05). Before nursing, there was no significant difference in the nutritional indexes between the two groups (P > 0.05). After nursing, the nutritional indexes of the observation group were better than those of the control group (P < 0.05). Before nursing, there was no significant difference in the humoral and cellular immune indexes between the two groups (P > 0.05). After nursing, the humoral and cellular immune indexes of the observation group were better than those of the control group (P < 0.05). Before nursing, there was no significant difference in the gastrointestinal hormone levels between the two groups (P > 0.05). After nursing, the gastrointestinal hormone levels of the observation group were better than those of the control group (P < 0.05). The incidence of postoperative complications in the observation group was lower than that in the control group (P < 0.05). Conclusion: For elderly patients with gastric cancer, early enteral nutrition nursing after surgery can improve their nutritional indexes and gastrointestinal hormone levels, enhance their immune ability, and prevent the incidence of postoperative complications, with good effects.