Fixed-width press machine and rolling control method thereof

The invention discloses a fixed-width press machine and a rolling method thereof. The fixed-width press machine comprises a controller, an inlet roller way, an outlet roller way, an inlet upper pinchroll, an inlet lower pinch roll, an outlet upper pinch roll, an outlet lower pinch roll, a first high-temperature metal detector and a second high-temperature metal detector; the inlet roller way andthe outlet roller way are used for being in communication connection with the controller and used for conveying slabs; the inlet upper pinch roll, the inlet lower pinch roll, the outlet upper pinch roll and the outlet lower pinch roll are used for being in communication connection with the controller and are sequentially arranged between the inlet roller way and the outlet roller way; and the first high-temperature metal detector is arranged at the inlet roller way, the second high-temperature metal detector is arranged at the outlet roller way, and the first high-temperature metal detector and the second high-temperat