Background: The functional prognosis of mechanical thrombectomy (MT) for mild acute ischemic stroke (AIS) with large-vessel occlusion (LVO) is controversial. To explore a more precise estimation, a meta-analysis was conducted. Methods: The relevant studies were identified by searching PubMed, Embase, Web of Science, and Cochrane Collaboration Database until October 2021. The pooled analysis, subgroup analysis, sensitivity analysis, and publication bias examination were all conducted. The meta-analysis was performed by using Stata 12.0. Results: Eleven studies were included with a total of 1,929 subjects, including 794 patients receiving MT and 1,135 patients receiving medical management. The pooled analysis showed that MT might be not associated with functional prognosis among mild AIS with LVO (excellent functional prognosis: risk ratio (RR) = 1.07, 95% confidence interval (CI) = 0.94–1.21, p = 0.294; favorable functional prognosis: RR = 1.01, 95% CI = 0.96–1.06, p = 0.823). The statistical stability and reliability were demonstrated by the sensitivity analysis and publication bias outcomes. Conclusion: Our meta-analysis suggests that MT may be not associated with functional prognosis of mild AIS with LVO.