A molded guide rail is described. The molded guide rail includes a main body, a guide groove, a plurality of first limiting parts and a plurality of second limiting parts. The guide groove extends and passes through the main body. The first limiting parts and the second limiting parts are respectively connected to the main body at two opposite sides of the guide groove and partially cover the guide groove. A combination of the main body, the first limiting parts and the second limiting parts is an integrated structure.