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This invention provides a waste treatment device and method for PVB film production. The waste treatment device includes a working chamber, a heating element, a pressure plate, and a stirring assembly. The working chamber is used to contain PVB film waste and has an inlet and outlet at its top. The heating element is used to heat the PVB film waste in the working chamber. The pressure plate is located above the inlet and outlet and can reciprocate vertically under the drive of a first driving device. The pressure plate has a clearance opening. The stirring assembly includes a second driving device, a stirring driving device, and a stirring plate. The second driving device is located on the pressure plate and is used to drive the stirring driving device to reciprocate vertically. This invention heats the PVB film waste using a heating element, causing the PVB film waste to be pressed in a slightly softened state. The thermoplasticity of PVB material allows the PVB film waste to adhere to each other, effectively solving the technical problem that waste blocks obtained by room temperature pressing are prone to springing back and loosening, requiring additional binding.