The invention discloses a method for producing a titanium/titanium alloy belt through combining a short-process four-roll and a twenty-roll mill. The method comprises the steps of fully annealing, shot blasting, acid pickling, threading and winding a titanium/titanium alloy coil with the thickness ranging from 3.0 to 3.2mm; carrying out four-roll rolling on the titanium/titanium alloy coil until the thickness ranges from 0.65 to 0.75mm, rolling for 2 to 4 times through the twenty-roll mill, and realizing the rolling on the titanium/titanium alloy coil with the thickness ranging from 0.1 to 0.5mm; and then degreasing and annealing to obtain the ultra-fine grain thin titanium/titanium alloy belt. Grains in the titanium/titanium alloy belt are fully smashed by utilizing a large rolling forceof the four-roll, meanwhile, the target thickness, a plate type and the required surface quality of the final product are realized by utilizing the characteristics of high rolling precision, good rolling plate type and high rolling surface quality of the twenty-roll mill, the grain grade can be improved by more than two grades by adopting the method, and procedures such as degreasing, stress relief annealing and acid pickling between different rolling processes are avoided, so that the production process is greatly shortened, and the production efficiency is greatly improved.
