The invention discloses a pressing method and its pressing equipment. The pressing method comprises the steps of: first, providing pressing equipment, comprising a reaction chamber, a first platform and a second platform, and an air bag, with the first platform and the second platform oppositely positioned in the reaction chamber, and the air bag disposed one surface of the first platform towards the second platform; then, arranging a first assembly and a second assembly between the first platform and the second platform; later, forming a first pressure inside the reaction chamber and forming a second pressure inside the air bag, with the first pressure smaller than the second pressure so as to expand the air bag; then, pressing the first assembly and the second assembly that are positioned between the first platform and the second platform with the air bag of the first platform. Thus, the air bag in the invention can compensate a pressure difference automatically, so that product yield rate problems like bubble generation caused by different pressing forces at different points on a joint face of the first assembly and the second assembly can be reduced.