PVC lamination machines are mainly divided into ordinary negative pressure machines and positive and negative pressure machines, which differ greatly in working principle, structural design, working pressure and product processing adaptability, directly affecting lamination flatness, fitting tightness and finished product quality. This article systematically compares the core differences between the two types of equipment, elaborates their structural advantages, working performance and applicable scenarios, and explains the key technical indicators for judging equipment quality, providing professional reference for woodworking lamination equipment selection.