The article analyzes the traditional and innovative worldview components in the political doctrine of Saint-Pierre, developed in his work Project for the Establishment of Perpetual Peace in Europe. Reflecting on the political prospects of mankind, the abbot highlighted the psychological motives that, in his opinion, determine acts of rulers. He proceeded from the idea that human nature does not change, his worldview is characterized by the belief that the final forms of government are already present in his epoch and are not subject to transformation. In his view, the existing political structure prevailing in various countries should not be changed, but there should be formed a supranational collective body, authorized to carry out international arbitration. Referring to Henry IV’s plan for universal peace in Europe, Saint-Pierre did not literally repeat it, although in order to promote his ideas he presented himself as a follower of the great monarch. Proclaiming the value of impartial reasoning, the abbot attached particular importance to convincing the rulers that war is not beneficial to them personally or to their subjects. He connected happiness with the wealth and prosperity of society, subordinating politics to morality. Recognizing progress in the intellectual and economic spheres, he treated wars as a factor impeding mankind’s progress. Unlike most philosophers of Enlightenment, Saint-Pierre did not adhere to anticlericalism. He believed that the other states would join gradually join united Europe, although this process would certainly be very long. Saint-Pierre attached exceptional importance to the legal side of the issue, to the formal agreement, and he definitely underestimated economic differences among nations.