This article is about the Capes Portal of Periodicals and its link to social investigations related to critical epistemology, with the objective of analyzing the Portal as a vehicle of information for research aligned with the historic materialistic conception, considering the expansion of digital libraries and the importance of opposing the adversities of the capitalist system. In light of the historical materialistic conception, the methodology that was utilized involved a logical-dialectical approach, comparative procedures, data collection through analytical reading, the systematization of ideas, and critical analysis. The final considerations of the article indicate that the Capes Portal of Journals potentiates useful information for investigations related to critical epistemology, but it is necessary to seek constant improvement in the operational aspects of the portal in order for it to have a significant impact on research.