The invention discloses a method for casting and solidifying the end portion of a fiber rope. The method relates to the fiber rope and a joint. The method comprises the steps of scattering one end of the fiber rope, folding the end portion in half in an inserting and weaving mode, thickening the end portion of the fiber rope, inserting the partially thickened end portion of the fiber rope from the small-bore end of the joint, scattering fiber strands, inserted into the joint, of the fiber rope into a cone shape, allowing the fiber strands to be evenly distributed inside a casting cup, slowly pouring prepared resin into the casting cup, and allowing the end portion of the fiber rope and the joint to be solidified together. The joint and the thickening portion of the fiber rope are pre-tensioned, and fibers of the thickening portion are evenly stressed so that whole breaking force is improved. The method is used for solidification of the end portion, connected with the resin, of the fiber rope. According to the method for casting and solidifying the end portion of the fiber rope, the proper resin, the proper joint with an inverted-cone-shaped hole and a proper solidification part are selected for partial thickening and casting, solidification strength of the rope is improved so that the aim of equal strength casting of the fiber rope can be achieved, and therefore a fiber use ratio is improved.