The invention provides a composite structure of a printing layer in a decoration film production apparatus, and belongs to the technical field of machines. A technical problem that the efficiency of present decoration film production apparatuses is low is solved in the invention. The decoration film production apparatus comprises a frame and a long and narrow workbench fixedly arranged on the frame, the composite structure of the printing layer comprises an extruder, the extruder is arranged in a position of the workbench above the frame, close to a first material placing rotating shaft, the extruder is fixedly provided with an extruding cylinder, the lower end of the extruding cylinder is flat, the lower end of the extruding cylinder is provided with a long and narrow extruding opening, the extruding opening faces the workbench, the length direction of the extruding opening parallels to the width direction of the workbench, one side of the extruding cylinder close to a film collecting rotating shaft is sequentially provided with a silicone rubber pressure roller and cooling steel rollers, and the extruder, the silicone rubber pressure roller and the cooling steel rollers can synchronously move up and down relative to the bench surface of the workbench and can be synchronously located. The composite structure realizes one-shot formation of a decoration film.