Coating device, coating method and pole piece production system

The embodiment of the invention provides a coating device, a coating method and a pole piece production system.The coating device comprises a feeding mechanism, a detection mechanism, a controller and two rollers, the two rollers are arranged at intervals to form a roller gap, the feeding mechanism is used for conveying materials to the roller gap from the upper side of the roller gap, and the two rollers are used for rolling the materials and forming a film layer; the detection mechanism is arranged on the upper side of the roller gap and used for detecting the height of materials stacked on the upper side of the roller gap, and the controller is connected to the detection mechanism and the feeding mechanism and used for adjusting the material conveying amount of the feeding mechanism. The controller is connected to the feeding mechanism for detecting the height of the material accumulated on the upper side of the roller gap, so that the controller can adjust the material conveying amount of the feeding mechanism according to the height of the material on the upper side of the roller gap, the material conveying amount of the feeding mechanism in the coating device can be automatically adjusted, the automation degree of the coating device is high, and the coating efficiency is improved. And the production convenience of the film layer in the pole piece is improved.