The invention discloses a portable power adapter which has small occupied space, aesthetic and harmonic appearance, and convenient deploying and collecting and carrying. The invention comprises a housing, a power input and an output line (51, 53), a power convention circuit (6), and a wire lock-up mechanism; the center of the housing is provided with a hollow stepped shaft column (2), the external sidewall of the shaft column (2) is provided with a ring diaphragm (22), an upper and a lower rotating disc (31, 32) is provided above and below the ring diaphragm (22), the stepped column surface of the upper and the lower rotating discs are respectively provided with external conducting layers (301, 302), the shaft column (2) is provided with an inner conducing layers (201, 202), the power input and the output lines (51, 53) are connected with the external conducting layers (301, 302) respectively, the input and the output ends of the power convention circuit (6) are connected with the inner conducting layers (201, 202), an upper and a lower twisting spring (41, 42) are connected between the upper and the lower rotating discs (31, 32) and the shaft column (2), and the power input and the output lines (51, 53) are wound the periphery of the upper and the lower rotating discs (31, 32).