A hook module of an electronic device is disclosed. The hook module includes a base and a hook body. The base includes two positioning pillars and a side board, and the hook body is located on the base with one end passing through the side board. The hook body includes two elastic arms located at two edges of the hook body, respectively, and each of the elastic arms includes an abutting portion. When the hook body is moved by force applied on it, the two abutting portions abut against the two positioning pillars. The two positioning pillars and the two abutting portions move relative to each other to make the two elastic arms deformed, and an elastic restoring force generated from the two elastic arms drives the hook body to restore.