The invention discloses a machining process for rubber special for a radial tire. According to the machining process, firstly, recycled rubber raw materials are divided into two grades according to evaluation results of enterprise quality detection standards and smashed into 40 cm x 10 cm x 8 cm-50 cm x 15 cm x 20 cm rubber blocks correspondingly, and the cleaned graded rubber raw materials are mixed according to the weight ratio being 1-3:1-3. The mixed rubber materials are subjected to primary smashing, flotation and stirring, secondary smashing and flotation and stirring, flotation needs larger than or equal to 20 min of time, then the mixed rubber materials are subjected to two-stage extrusion flotation, flotation needs larger than or equal to 12 min of time, and the rubber materials are made into a rubber ball shape. The rubber materials are subjected to one to four stage crepe treatment to be made into a continuous sheet shape, the thickness is 6-12 mm, and the rubber materials obtained after crepe treatment are subjected to granulation treatment to be made into rubber particles being 6-12 mm in diameter. The rubber particles are subjected to rubber drawing vibration treatment, dried at the temperature being 82-108 DEG C according to the standard being 4-6 t/h of the rubber materials, and then cooled to the room temperature. Through the machining process, the equipment impurity removing ratio is increased, the condition that the rubber structure is damaged due to over-machining is avoided, equipment arrangement of a production line is simplified, the total failure rate is lowered, rubber smashing quantity is reduced, and the production efficiency is improved.