A binding system for sheets of paper or any other material and of any size, as well as for architectural or industrial technical drawings, comprising a first element and a second element, the binding system being formed based on the two elements, wherein the first element is a pin with a main body having a cylindrical section, on one of the ends of which is arranged a circular stop, and on the other end of which is arranged a conical narrowing finished with a hemispherical tip, to facilitate its entry into the perforations made in the sheets, wherein the second element is a clip-type mechanism formed by two facing semicircles, the second element comprising two facing piercing elements with conical shapes that can pierce the first element, wherein the conical shape prevents tears, since there are no edges on the contact surface, the second element further comprising a tab, the tab performing the function of a hinge, by allowing when flexed the aligning of the piercing elements and their introduction into the first element, wherein the second element further comprises and anti-return catch and cavities (2F, 2G), the anti-return catch being formed by two teeth (2D, 2E), and wherein to prevent the second element from opening once placed, the two teeth (2D, 2E) of the catch fit into the cavities (2F, 2G), wherein the catch can be introduced into the cavities (2F, 2G) by flexing the tab, which allows it to rise above the crests of the cavities (2F, 2G), the second element further comprising two formations (2K, 2L), and wherein the two formations (2K, 2L) that form the inner cylindrical surface of the second element can achieve the fitting of the second element on the cylindrical surface of the first element. the first element is a pin with a main body having a cylindrical section, on one of the ends of which is arranged a circular stop, and on the other end of which is arranged a conical narrowing finished with a hemispherical tip, to facilitate its entry into the perforations made in the sheets, wherein the second element is a clip-type mechanism formed by two facing semicircles, the second element comprising two facing piercing elements with conical shapes that can pierce the first element, wherein the conical shape prevents tears, since there are no edges on the contact surface, the second element further comprising a tab, the tab performing the function of a hinge, by allowing when flexed the aligning of the piercing elements and their introduction into the first element, wherein the second element further comprises and anti-return catch and cavities (2F, 2G), the anti-return catch being formed by two teeth (2D, 2E), and wherein to prevent the second element from opening once placed, the two teeth (2D, 2E) of the catch fit into the cavities (2F, 2G), wherein the catch can be introduced into the cavities (2F, 2G) by flexing the tab, which allows it to rise above the crests of the cavities (2F, 2G), the second element further comprising two formations (2K, 2L), and wherein the two formations (2K, 2L) that form the inner cylindrical surface of the second element can achieve the fitting of the second element on the cylindrical surface of the first element.