Disclosed in the embodiments of the present application are a processing method and apparatus for rollback from small data transmission (SDT) to non-SDT, which can be applied to cellular mobile communication technology. The method comprises: during an SDT process of a terminal device, when it is determined that a designated trigger condition is satisfied, performing rollback from the SDT process to a non-SDT process. Therefore, a terminal device can perform rollback from an SDT process to a non-SDT process before the SDT process is completed, such that the terminal device performs data transmission on the basis of the non-SDT