Objective: To evaluate the current evidence on the effectiveness of simultaneous combination of mirror therapy and electrical stimulation in the recovery of upper limb motor function after stroke, compared with conventional therapy, mirror therapy or electrical stimulation isolated. Data sources: Articles published in PubMed, Web of Science, Scopus, Physiotherapy Evidence Database (PEDro), Cochrane Central register of controlled trials and ScienceDirect up to July 2020. Review methods: The PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines were followed. Methodological quality was assessed using the PEDro tool. The RevMan 5.4 statistical software was used to obtain the meta-analysis, through the standardized mean difference and 95% confidence intervals (CI), and to evaluate the risk of bias. The GRADE approach was employed to assess the certainty of evidence. Results: Eight articles were included in this systematic review, seven were included in the meta-analysis. A total of 314 participants were analyzed. The overall quality of the articles included in this review was good. There was no overall significant mean difference on upper limb motor function after stroke using the Upper-Extremity Fugl-Meyer Assessment by 1.56 (95% CI = –2.08, 5.20; P = 0.40; moderate-certainty evidence) and the Box and Block Test results by 1.39 (95% CI = –2.14, 4.92; P = 0.44; high-certainty evidence). There was overall significant difference in the Action Research Arm Test by 3.54 (95% CI = 0.18, 6.90; P = 0.04; high-certainty evidence). Conclusion: Direct scientific evidence about the effectiveness of the combined therapy of mirror therapy and electrical stimulation simultaneously for the improvement of the upper limb motor function after stroke is lacking. Further high-quality and well-designed research is needed.