Stretching-bending straightener for strips

The utility model discloses a stretching-bending straightener for strips. The stretching-bending straightener comprises a housing, two groups of bending roll systems, two groups of straightening roll systems, four sets of roll system gap adjusting mechanisms, a roll changing device, a quickly opening device, a guide roll and an opening detection roll, wherein six windows are arranged in the housing, an upper bending roll group No.1, a lower bending roll group NO.1, an upper bending roll group No.2, a lower bending roll group No.2, a straightening roll group No.1 and a straightening roll group N0.2 are arranged in vertical correspondence from left to right, and two spare rolls different from the two groups of bending rolls in diameter are arranged; and the roll changing device is arranged at the top of the housing, connecting rods are arranged between the end part of the roll changing device and the end parts of the two groups of bending roll systems. The stretching-bending straightener for strips has the bene