To evaluate the effect of thermal insulation nursing in the operating room on preventing hypothermia during laparoscopic radical resection of colorectal cancer. Sixty colorectal cancer patients undergoing laparoscopic radical resection from June 2022 to August 2023 were included. The research group received thermal insulation nursing interventions using medical heaters and infusion heaters, while the control group received routine nursing measures. Clinical data including vital signs, intraoperative and postoperative complications, recovery time, nursing satisfaction, and psychological and sleep status were compared between the two groups. Thirty minutes after skin incision, both groups showed decreased body temperature, and systolic and diastolic blood pressure compared to pre-surgery levels, with no significant difference between groups (P > 0.05). However, the research group exhibited lower rates of intraoperative hypothermia, postoperative infection, and other complications, as well as shorter postoperative recovery times, hospital stays, anxiety, and depression scores compared to the control group (P < 0.05). Additionally, the research group demonstrated higher comfort scores, shorter sleep latency, longer actual sleep time, and higher nursing satisfaction rate (P < 0.05). Thermal insulation nursing intervention in the operating room during laparoscopic radical resection of colorectal cancer contributes to maintaining vital signs, preventing intraoperative hypothermia, reducing postoperative complications, expediting recovery, and improving psychological well-being and sleep quality. This intervention enhances patient comfort and nursing satisfaction in perioperative care.