The invention belongs to the field of special steel production machining of metallurgical industries and particularly relates to a low-temperature rolling production method of high-performance 20CrMnTi gear steel. With 20CrMnTi continuous casting slabs as raw materials, the method comprises the following working processes of heating, descaling, rough rolling, continuous rolling, water penetrationand cold rolling, finish rolling of a rod material sizing reduction unit and cooling through a cold bed in sequence, and finally a finished product rod material is obtained. According to the low-temperature rolling production method of the high-performance 20CrMnTi gear steel, the heating technical system of a heating furnace is optimized, the heating energy consumption is reduced, the productioncost is reduced, and the environment is protected; the high-performance 20CrMnTi gear steel is obtained, grain size control, rigidity control and mechanical property control over the high-performance20CrMnTi gear steel are superior than control in a common rolling technology, the metallographic structure of the high-performance 20CrMnTi gear steel is ferrite and pearlite, the rigidity is generally 170-220 HBW, the grain size of the high-performance 20CrMnTi gear steel is small and even, the grain size of the rolled round steel at least reaches 9.0 grade, and the comprehensive mechanical properties of the high-performance 20CrMnTi gear steel are superior than those of the common rolling technology.