This article aims to systematize the cosmological thinking of Heraclitus from the analysis of the relevant fragments. The analysis will be carried out on the basis of the systematicity of the Ephesian’s thought, which implies not only that Heraclitus has a “philosophy”, but also that philosophy is a philosophy about the whole, with cosmology as one of its fundamental parts insofar as it links the universe with man through the idea of the lógos.