The article examines the ways and forms of possible influence of teachings of Philolaus on the philosophy of Plato. At the beginning, there is a historiographic review of the reports on the adoption by Plato of a number of ideas from Pythagorean sources. It turns out that the popular story about Plato's plagiarism is very ambiguous, and it was "pulled out of the closet" every time in connection with certain ideological or even commercial needs. The most active "orthodox Pythagoreanism" was attributed to Plato in the 1st century BC. - 1 century. AD, when dozens of pseudo-Pythagorean fakes appear, "proving" the continuity of Plato's texts in relation to the Pythagorean ones, including texts signed by Philolaus. This must be taken into account when determining the authenticity of the Philolaus' fragments.