The invention relates to a control method for deviation of a rolling center line of cold continuously rolled strip steel. According to the control method, two position sensing devices are installed atan outlet of a rolling mill and used for detecting the deviation data of the rolling center. Corresponding abnormal conditions can be found at the first time through automatic analysis on the deviation data of the center line of the outlet of the rolling mill, and the accuracy of the setting of the rolling process parameters is ensured through compensation adjustment of the setting value of the rolling process parameters. The problems that a current detection method for the center line deviation is not accurate enough and the dynamic adjustment of the rolling process parameters after the deviation cannot be realized are solved.