A method for making a carbon fiber wheel rim, the carbon fiber wheel rim having a circular engaging seat formed with a circular engaging groove for engagement with a tire, the method comprising: preparing a circular outer supporting piece having a cross-section that is complementary in shape with the circular engaging groove, and winding continuously and circumferentially at least one first carbon-fiber yarn around the circular outer supporting piece to form a plurality of first carbon fiber layers, characterized in that: each of the first carbon fiber layers is formed by winding the first carbon-fiber yarn in a mutually-different winding angle, the circular outer supporting piece and the first carbon fiber layers constituting a circular engaging seat preform, and the method further comprises: connecting a circular inner supporting piece to the circular engaging seat preform; connecting a circular reinforcement piece to the circular inner supporting piece oppositely of the circular engaging seat preform so that the circular engaging seat preform, the circular inner supporting piece and the circular reinforcement piece constitute an assembly; winding continuously and circumferentially at least one second carbon-fiber yarn around the assembly to form a plurality of second carbon fiber layers, each being formed by winding the second carbon-fiber yarn in a mutually-different winding angle; fixing the assembly with the second carbon fiber layers to form an outer frame preform on the assembly, the outer frame preform having an outer circular surface distal from the circular reinforcement piece; and cutting the outer frame preform and the circular engaging seat preform from the annular outer surface of the outer frame preform to form a circular trench, followed by removing the circular outer supporting piece from the circular trench to form the circular engaging groove of the circular engaging seat and an outer frame. preparing a circular outer supporting piece having a cross-section that is complementary in shape with the circular engaging groove, and winding continuously and circumferentially at least one first carbon-fiber yarn around the circular outer supporting piece to form a plurality of first carbon fiber layers, characterized in that: each of the first carbon fiber layers is formed by winding the first carbon-fiber yarn in a mutually-different winding angle, the circular outer supporting piece and the first carbon fiber layers constituting a circular engaging seat preform, and the method further comprises: connecting a circular inner supporting piece to the circular engaging seat preform; connecting a circular reinforcement piece to the circular inner supporting piece oppositely of the circular engaging seat preform so that the circular engaging seat preform, the circular inner supporting piece and the circular reinforcement piece constitute an assembly; winding continuously and circumferentially at least one second carbon-fiber yarn around the assembly to form a plurality of second carbon fiber layers, each being formed by winding the second carbon-fiber yarn in a mutually-different winding angle; fixing the assembly with the second carbon fiber layers to form an outer frame preform on the assembly, the outer frame preform having an outer circular surface distal from the circular reinforcement piece; and cutting the outer frame preform and the circular engaging seat preform from the annular outer surface of the outer frame preform to form a circular trench, followed by removing the circular outer supporting piece from the circular trench to form the circular engaging groove of the circular engaging seat and an outer frame. connecting a circular inner supporting piece to the circular engaging seat preform; connecting a circular reinforcement piece to the circular inner supporting piece oppositely of the circular engaging seat preform so that the circular engaging seat preform, the circular inner supporting piece and the circular reinforcement piece constitute an assembly; winding continuously and circumferentially at least one second carbon-fiber yarn around the assembly to form a plurality of second carbon fiber layers, each being formed by winding the second carbon-fiber yarn in a mutually-different winding angle; fixing the assembly with the second carbon fiber layers to form an outer frame preform on the assembly, the outer frame preform having an outer circular surface distal from the circular reinforcement piece; and cutting the outer frame preform and the circular engaging seat preform from the annular outer surface of the outer frame preform to form a circular trench, followed by removing the circular outer supporting piece from the circular trench to form the circular engaging groove of the circular engaging seat and an outer frame.