The embodiment of the invention provides a manufacturing method for a sound absorbing panel, the sound absorbing panel and a sound absorbing device, and relates to the field of sound absorbing panels.The manufacturing method for the sound absorbing panel comprises the steps of bonding and pressing, wherein the bonding step involves that an adhesive is used for bonding multiple aluminum scraps, sothat the aluminum scraps and the adhesive form a blank, and the pressing step involves that pressing equipment is used for pressing the blank, so that the blank forms the sound absorbing panel. The manufacturing method for the sound absorbing panel has the advantages that the process is simple, and the cost is low.