A power bank assembly includes a housing, a power bank casing, a clasp structure, and a fastening structure. The clasp structure is correspondingly formed on a first end of the housing and a first end of the power bank casing to enable the first end of the housing to engage with the first end of the power bank casing, and the clasp structure also allows the housing to rotate relative to the power bank casing and about the first end of the housing serving as a pivot. The fastening structure is correspondingly formed on the second end of the housing and the second end of the power bank casing, and the fastening structure secures the housing to the power bank casing when the second end of the housing touches the second end of the power bank casing.