A power adapter assembly structure is disclosed and includes a housing, a circuit board, a socket and an elastic element. The circuit board including a first abutting surface and the socket including a second abutting surface are fastened in the housing. The elastic element connected between the circuit board and the socket includes a main body, a first hanging arm and a second hanging arm. The first hanging arm and the second hanging arm are disposed at two opposite ends of the main body, and constantly abuts the first abutting surface and the second abutting surface, respectively. A first gap is formed between the main body and the first abutting surface, and less than a first length of the first hanging arm. A second gap is formed between the main body and the second abutting surface, and less than a second length of the second hanging arm.