Objective. This study examines the effects of the 3S2E nursing management mode on patients with severe pneumonia in the intensive care unit’s respiratory function, psychological status, and quality of life (ICU). Methods. According to a random number table, 82 ICU patients with severe pneumonia who were admitted between March 2021 and March 2022 were enrolled and assigned to the control and observation class (n = 41, respectively) in a 1 : 1 ratio. The observation class added 3S2E manner in addition to ordinary breastfeeding, whereas the control class received treatment in the usual nursing mode. The two groups’ preintervention and postintervention times for mechanical ventilation, white blood cell count (WBC) recovery, duration of hospital stay, problems, respiratory function, psychological state, and living quality were compared. Results. Fever time abatement, mechanical ventilation time, WBC recovery time, and length of hospital stay in the observation category were found to be shorter in comparison with the control class ( P < 0.05 ). In contrast to the other group, the observation group had fewer issues ( P < 0.05 ). Both teams’ oxygenation indices and SaO2 were higher after the intervention ( P < 0.05 ), with the observation team’s index being higher than the control group’s index. The total SAS and SDS scores of the two groups were less in the postintervention period than in the preintervention period, with the observational class having lower postintervention SAS and SDS ratings than the comparison group ( P < 0.05 ). The postintervention ratings in the observation class were higher than those in the control, and the World Health Organization Quality of Life (WHOQOL) scale scores in the 2 categories were greater after the intervention than they were before ( P < 0.05 ). Conclusion. 3S2E nursing management model improves respiratory function, alleviates negative emotions, and improves living quality in ICU patients with severe pneumonia.