Plantar fasciitis is very troublesome in clinical fields. Although steroid injection has been a widely used treatment option in musculoskeletal disorders, there have been arguments about the effectiveness in plantar fasciitis. This study is to determine the effectiveness of steroid injection in the treatment of plantar fasciitis. Meta-analysis was conducted using searching engines such as Google Scholar, PubMed, CINAHL, Embase and manual searching which were searched to December 2017. The following key search terms were used; plantar fasciopathy fasciitis in google scholar, “fasciitis, plantar”[Mesh] with two filter options “Randomized Controlled Trial” and “human” in PubMed, plantar fasciopathy fasciitis in CINAHL, plantar AND fasciopathy AND (“fasciitis” OR “fasciitis”/exp OR fasciitis) in Embase. Two articles were also found using manual searching. Total 35 articles were found and duplicates were removed. Two reviewers reviewed and selected the articles, which has randomized controlled design and eligible data. Four articles were determined to be relevant, meeting inclusion and exclusion criteria. We found that the overall standardized mean differences of pain outcome between steroid injection and other treatments or sham was −0.57 (95% confidence interval: −0.83 to −0.30), with low heterogeneity ( P = 0.52, I 2 = 0%) at 1 month, but −0.33 (95% confidence interval: −0.76 to 0.10, P = 0.13, I 2 = 50%) at 3 month. It suggested evidence of the effectiveness of short-term steroid injection, compared with autologous blood injection or other conservative treatment, but limited evidence of long-term effectiveness and functional improvement. Although steroid injection in treating plantar fasciitis has been arguing, there is evidence of the effectiveness of steroid injection in relieving pain for 1 month. But further study is needed to determine long-term effectiveness of steroid injection.