Aim: To determine whether continuous venovenous hemodiafiltration (CVVHDF) plus standard medical therapy (SMT) vs. SMT alone prevents rhabdomyolysis (RM)-induced acute kidney injury (AKI) and to analyze the related health economics.Methods: This retrospective cohort study involved patients with RM without AKI, coronary heart disease, or chronic kidney disease treated with CVVHDF plus SMT (treatment group, n = 9). Matched patients with RM without AKI treated with SMT only served as controls (1:1 ratio). Baseline characteristics, biochemical indexes, renal survival data, and health economic data were compared between groups. In the treatment group, some biochemical data were compared at different time points.Results: At 2 and 7 days after admission, serum biochemical indices (e.g., myoglobin, creatine kinase, creatinine, and blood urea nitrogen) did not differ between the two groups. Total (P = 0.011) and daily hospitalization costs (P = 0.002) were higher in the treatment group than in the control group. After 53 months of follow-up, no patient developed increased serum creatinine, except for 1 treatment-group patient who died of acute myocardial infarction. In the treatment group, myoglobin levels significantly differed before and after the first CVVHDF treatment (P = 0.008), and serum myoglobin, serum creatinine, and blood urea nitrogen decreased significantly at different time points after CVVHDF.Conclusions: Although CVVHDF facilitated myoglobin elimination, its addition to SMT did not improve serum myoglobin or other biochemical indices or the long-term renal prognosis. Despite similar hospitalization durations, both total and daily hospitalization costs were higher in the treatment group.