ObjectiveTo systematically review the effect of doula delivery on postpartum depression.MethodsWe searched The Cochrane Library, Web of Science, PubMed, EMbase, CBM, CNKI and WanFang Data databases to collect relevant randomized controlled trials (RCTs) about the effect of doula delivery on postpartum depression from inception to March 24th, 2017. Two reviewers independently screened literatures, extracted data and assessed the risk of bias of included studies. Then, meta-analysis was performed by using RevMan 5.3 software.ResultsA total of 19 RCTs involving 10 921 participants were included. The results of meta-analysis showed that the doula delivery could reduce the incidence of postpartum depression (RR=0.36, 95%CI 0.29 to 0.46, P<0.001), and SDS score in doula delivery group was superior to that in the control group (MD=–7.37, 95%CI –11.01 to –3.72, P<0.001).ConclusionThe current evidence shows that doula delivery can reduce the incidence of postpartum depression. Due to the limited quantity and quality of included studies, the above conclusion is still needed to be verified by more high quality studies.