The invention discloses a plate extrusion system which comprises a plate extruder, a microwave heating device, a slide and a supporting pipe. The microwave heating device is in sliding connection withthe slide. When the microwave heating device is located at the initial end of the slide, a feeding inlet of the microwave heating device is connected with a discharging outlet of the plate extruder.When the microwave heating device is located at the tail end of the slide, a discharging outlet of the microwave heating device is connected with the supporting pipe. According to the plate extrusionsystem provided by the invention, the process of plate extrusion, drying and conveying can be continuously completed, subsequent plate machining and treatment are facilitated, plates directly enter the microwave heating device after being discharged out of the extruder, dried plates directly enter the supporting pipe after being discharged, the situation that the plates are damaged due to other factors is avoided, the plate quality can be well guaranteed, the system working efficiency is high, and the plate machining efficiency can be improved easily.