Tension device of slitting machine

The utility model discloses a tension device of a slitting machine. The tension device comprises a frame arranged between a coiling device and a cutting device of the slitting machine; a tension pressing mechanism and a tension roller mechanism are arranged on the frame in turn; the tension pressing mechanism comprises an upper pressing plate and a lower pressing plate which are parallel up and down; the upper pressing plate is connected with a first power unit for driving the upper pressing plate to rise or fall; the tension roller mechanism comprises an upper pressing roller and a lower pressing roller which are parallel up and down; the upper pressing roller and the lower pressing roller are in driving connection in a manner of rotating at same speed and in reverse directions; the lower pressing roller is connected with a magnetic powder brake for providing tension for the lower pressing roller; the upper pressing roller is connected with a second power unit for driving the upper pressing roller to rise or fall. By adopting the scheme and additionally arranging a tension roller adjusting mechanism on a traditional tension pressing-type tension adjusting device, the tension is adjusted by the combined effect of the tension pressing plates and the tension rollers; and thus the adjusting effect of the tension is good, and the surface of a steel sheet is not damaged; the tension device has a simple structure, is easy to manufacture and maintain.