The invention provides a method for controlling C warp plate shape defects during hot rolling of a titanium belt, and belongs to the field of hot rolling process control of a metal plate strip. The method comprises the following steps that first, the characterization and measurement of C warp deflection are carried out; then a finite element simulation model is established based on actual field equipment and process data, the C warp deflection of the titanium belt under asymmetric friction state is calculated, and the C warp deflection under roll diameter differences of different working rollsand under the same rolling conditions is solved; then a relationship between the roll diameter difference of the titanium belt working rolls with different thickness specifications and the C warp deflection regulating amount is fitted; and finally according to the actual titanium belt C warp deflection defects on a hot rolling industry production site, the difference in roll diameter of the workrolls that need to be adjusted is calculated, through reasonable diameter matching ratio of the upper rolls and the lower rolls of the work rolls, the C warp plate shape defects of the hot-rolled titanium belt can be improved, and the purpose of improving finished plate shape quality of the titanium belt is achieved.
