Flexible finishing mill group, continuous casting and rolling flexible production line and corresponding production method

The invention relates to a flexible finishing mill group and a production method thereof, a continuous casting and continuous rolling flexible production line provided with the flexible finishing mill group and a production method thereof, the flexible finishing mill group comprises six finishing mills, five finishing mills serve as working rolling mills, and the remaining finishing mill serves as a standby rolling mill; and an inter-pass heating device is arranged between every two adjacent finishing mills. According to the method, the inter-pass heating device is additionally arranged in the finishing mill group, active temperature control treatment can be conducted on the wedge-shaped area of the steel under the rolling mill switching working condition, the uniformity and consistency of the temperature in the thickness direction when the wedge-shaped area of the steel enters the next pass of rolling are improved, and continuous non-stop production of the flexible finishing mill group is achieved; and adver