This work contributes to a reflection on Karl's Rahner's Trinitarian theology and its fundamental implications for theological practice. We will punctuate three significant consequences that are correlated with your system of thought in view of the renewal of trinitarian theology. The first implication is the anthropological dimension, the second dimension is theological-spiritual one and the last one deals with the ecclesial question. The relevant aspect in Rahner's Trinitarian thought is his critical rationality about the condition of estrangement in which the Trinity found itself in relation to Christian life and theological thought. In this perspective, in Rahner's thinking, mystagogy is latent, since all of his work expresses an intertwining with spirituality and has an accentuated existential-anthropological relevance. The research will be divided into three parts: at first, some hints of his transcendental anthropology will be presented, through which, the conditions of possibilities that allow man to experience in the depths of his existence an openness to the absolute mystery. In this sense, his theology starts from the human being and his questions, without losing its theocentric character, whose anthropological orientation requires constant updating to respond to the concerns of today's men. Then, the main elements of the Trinitarian theological renewal with the axiomatic formulation that says the "Economic Trinity and the Immanent Trinity and vice versa", focusing that this rahnerian narrative gains deep support in contemporary theological thought by establishing the mutual belonging of these two categories: transcendence and history. Finally, we will highlight the existential dimension of the mystery, as well as some key concepts of the Church moved by the dynamics of synodality will be mentioned.