Metal plate polishing machine and control method therefor

A metal plate polishing machine, comprising a work base (1), wherein the work base (1) is provided with a conveyor belt (3) for conveying a metal plate (2), a feed motor (4) for driving the conveyor belt (3), a polishing roller (5) located above the conveyor belt (3), a main motor (6) for driving the polishing roller (5), a lifting mechanism (7) for driving the polishing roller (5) to move up and down, and a chassis (8) with a controller (9) inside, a panel of the chassis (8) is provided with a plurality of buttons (10), the feed motor (4) and the main motor (6) are electrically connected with the controller (9) respectively, the conveyor belt (3) is arranged at a front position of the work base (1), the feed motor (4) is arranged behind the conveyor belt (3), the feed motor (4) is in transmission connection with a drive shaft (3.1) on the conveyor belt (3), the main motor (6) is located behind the conveyor belt (3), the main motor (6) is in transmission connection with the polishing roller (5), and the chassis (8) is arranged in a width direction on one side of the main motor (6) away from the feed motor (4).