Purpose The object of this study is to describe the existing evidence and completed the first systematic review meta-analysis between frailty and neurosurgical outcomes in brain tumor patients. The primary outcome is mortality and postoperative complications, the second outcomes including readmission rate, discharge disposition, length of stay (LOS) and hospitalization costs.Methods Seven English databases and four Chinese databases were searched to identify the neurosurgical outcomes and frailty among patients with brain tumor. With no restrictions on the publication period. According to the JBI manual for evidence synthesis and the PRISMA guidelines, two independent reviewers applied the Newcastle-Ottawa Scale (NOS) for cohort studies, the Joanna Briggs Institute (JBI) Critical Appraisal Checklist for Cross-Sectional Studies to evaluate the methodological quality of each study.Results 13 papers included in the systematic review and prevalence of frailty ranged from 1.48% to 57%. Frailty is significantly associated with increased the risk of mortality (OR,1.63; CI,1.33-1.98; P<0.001), postoperative complications (OR,1.48; CI,1.40-1.55; P<0.001; I2=33%), non-routine discharge position than home (OR,1.72; CI,1.41-2.11; P<0.001), prolonged LOS in brain tumor patients (OR=1.25; CI=1.09-1.43; P=0.001) and higher hospitalization costs in brain tumor patients. But Frailty was not independently associated with readmission (OR,0.99; CI,0.96-1.03; P =0.74)Conclusion Frailty is an independent predictor of mortality, postoperative complications, non-routine discharge position rate, LOS and hospitalization costs in brain tumor patients. Besides frailty has a significant potential role in risk stratification, preoperative shared decision-making and perioperative management.