This paper aims to explain the idea of a “neoplatonic” criticism the traditional metaphysics by Schopenhauer. Thus, the paper aims to verify Vittorio Hösle’s thesis according to which Schopenhauer's philosophy would be placed between subjective idealism of Kant and Plato's objective idealism and finally would be presented as basis [Grundlage] of General Metaphysics. Unlike the thesis Hösle, will show in this paper that on one side Schopenhauer explicitly incorporates the philosophy of Plato to the extent that it is not subject to the principle of sufficient reason, characteristic of traditional metaphysics, and, on the other hand the author of The World as Will and Representation as it consciously critical metaphysics and Kantian philosophy...