Winding device for belts and ropes comprising: - a first element; - a second element rotatably and removably connected to the first element and comprising fastening means of a belt or rope; - catching means connected to the second element to allow a user to manually rotate the second element and the fastening means to wind the belt or rope blocked by the fastening means, wherein the second element comprises a pin on which the fastening means are made, said pin being rotatably and removably connected to the first element to wind on the pin the belt or rope, characterized in that the pin comprises at least one housing in which a projecting element is inserted, rotatable on its axis and having a first external surface adapted to go out of the housing when the projecting element is rotated in a first position, thereby allowing to increase the diameter of the pin, and having a second plane external surface which remains inside the housing when the projecting element is rotated in a second position, to enable the belt to go out of the pin when it is wound, wherein the projecting element comprises a projection obtained next to the first element adapted to be inserted in a continuous circular seat obtained in the first element, to connect the first element and the second rotatable element, preventing a disengagement of the pin during the winding operation. - a first element; - a second element rotatably and removably connected to the first element and comprising fastening means of a belt or rope; - catching means connected to the second element to allow a user to manually rotate the second element and the fastening means to wind the belt or rope blocked by the fastening means, wherein the second element comprises a pin on which the fastening means are made, said pin being rotatably and removably connected to the first element to wind on the pin the belt or rope, characterized in that the pin comprises at least one housing in which a projecting element is inserted, rotatable on its axis and having a first external surface adapted to go out of the housing when the projecting element is rotated in a first position, thereby allowing to increase the diameter of the pin, and having a second plane external surface which remains inside the housing when the projecting element is rotated in a second position, to enable the belt to go out of the pin when it is wound, wherein the projecting element comprises a projection obtained next to the first element adapted to be inserted in a continuous circular seat obtained in the first element, to connect the first element and the second rotatable element, preventing a disengagement of the pin during the winding operation. wherein the second element comprises a pin on which the fastening means are made, said pin being rotatably and removably connected to the first element to wind on the pin the belt or rope, characterized in that the pin comprises at least one housing in which a projecting element is inserted, rotatable on its axis and having a first external surface adapted to go out of the housing when the projecting element is rotated in a first position, thereby allowing to increase the diameter of the pin, and having a second plane external surface which remains inside the housing when the projecting element is rotated in a second position, to enable the belt to go out of the pin when it is wound, wherein the projecting element comprises a projection obtained next to the first element adapted to be inserted in a continuous circular seat obtained in the first element, to connect the first element and the second rotatable element, preventing a disengagement of the pin during the winding operation.