Method and system for calculating production time of steel coil in cold rolling process

The invention discloses a steel coil production time calculation method in a cold rolling process. The steel coil production time calculation method comprises the following steps that S1, the strip head welding time of a mother coil on line, the strip tail welding time of the mother coil on line, the tail cutting time of each child coil off line and the corresponding length are sequentially obtained; s2, determining the duration of each sub-roll in the on-line duration of the mother roll based on the length ratio of each sub-roll length in the mother roll; and S3, compensating the duration of each sub-roll in the on-line duration of the mother roll to the on-line strip head welding time of the mother roll, and obtaining the production start time and the production end time of each sub-roll. The invention provides an improved steel coil production time optimization calculation method in a cold rolling process, which is more in line with actual production and improves the accuracy of the production time in the