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The increasing awareness of people on green materials and chemistry has stimulated researchers around the globe to turn towards natural resources. As a growing topic with limitless potential, plants as corrosion inhibitors (PCI) have received substantial attention due to their eco-friendly, biodegradable, inexpensive, and abundantly available. Therefore, with the understanding of the importance of this topic, this study is conducted in the format of a descriptive systematic literature review (SLR) to assess the global research trends on PCI according to the number of published articles, co-authorships in correspond to countries/academic institutions and co-occurrences of author keywords. In the span of 25 years, from 1995 to 2020, 2237 articles from journal and conference proceedings were collected. Results have displayed that since 2003, the number of articles produced per year has increased significantly, wherein in 2020 alone, more than 250 articles have been published. The steady increment of publication has now resulted in a large accumulation of articles up until 2020. About 45% of the overall publications originate from India, Nigeria and China compared to other countries. In conclusion, the progress of PCI research presented in this study should provide a general overview of the correlation between researchers worldwide for better international collaboration and broadening knowledge.