Demoulding agent spraying device sprays the release agent to the surface of the pallet after the pallet surfaces are cleaned. The entire pallet surface or only the surface to be cast in concrete can be coated with a release agent. The pallet’s surface is roughly cleaned through Pallet cleaning device, then in depth through rotating roll brushes. Adjustable and swiveling nozzles spray oil on the steel plate and side moulds. Such operations are pivotal to ensure a top-quality finishing of the concrete panel surface.