Abstract: A manufacturing method of a functional leather comprises a step for preparing a first mixed solution by melting only chitosan, or melting chitosan and chitosan derivative into an acid solution; a step for preparing a second mixed solution containing a material radiating minus ions and the chitosan solution; and a step for depositing a leather into the second mixed solution, and a functional leather manufactured by the above method. This invention provides a functional leather product having strong antibacterial effect and deodorization effect and thereby, it is very helpful for a human being's health.