Objective. To explore the application of NRS2002 in preoperative nutritional screening of patients with liver cancer (LC). Methods. 60 LC patients treated in the First Affiliated Hospital of Gannan Medical University (January 2018–May 2021) were chosen as the research objects, and split into group J without nutritional risk and group Q with nutritional risk according to the results of NRS2002 to compare the preoperative situation, surgery-related indexes, hematological indexes, postoperative recovery, and incidence of complications between the two groups. Results. Group J (n = 28) and group Q (n = 32) showed no obvious difference in preoperative situation, and patients’ liver function indexes were within the normal range. The duration of surgery in group J was notably shorter compared with group Q (
P
<
0.05
). Alanine aminotransferase (ALT), aspartate aminotransferase (AST), direct bilirubin (DBIL), and albumin in group J were notably different from those of group Q (
P
<
0.001
) at 1 day after surgery. ALT and AST in group J were notably different from those of group Q at 3 days after surgery (
P
<
0.001
). No obvious differences were observed in the hematological indexes between the two groups at 5 days after surgery (
P
>
0.05
). The total amount of albumin infusion, postoperative hospitalization time, and hospitalization cost in group J were notably lower compared with group Q (
P
<
0.001
). The incidence of complications in group J was notably lower compared with group Q (
P
<
0.05
). Conclusion. Postoperative recovery of LC patients is closely related to their preoperative nutritional status, and those with poor nutritional status have a high incidence of postoperative complications and long recovery time. NRS2002 can effectively screen the nutritional status of patients and provide reference for prognosis evaluation.