Abstract: A manufacturing method for a vapor chamber, a vapor chamber and a middle frame vapor chamber are disclosed. The manufacturing method for a vapor chamber includes preparing different raw materials for various parts of the vapor chamber, and machining and molding the various parts according to predetermined shapes of the various parts by using corresponding raw materials, assembling the machined and molded various parts of the vapor chamber, and welding and sealing the assembled various parts of the vapor chamber, performing a surface heat treatment on the vapor chamber, performing a passivating treatment on the vapor chamber, assembling the vapor chamber, injecting water into the vapor chamber assembled with the liquid injection pipe, vacuumizing the vapor chamber injected with water, performing a sealing treatment on the vacuumized vapor chamber, and welding the vapor chamber with a reinforcing rib.