A portable power line pay-off rack is provided with a circular bottom support. A matched circular support frame is arranged on the bottom support, radial reinforcing connecting rods are arranged in a ring of the circular bottom support, a vertical shaft perpendicular to a plane where the ring of the bottom support is located is arranged in the circle center of the circular bottom support, a grooved track is circumferentially arranged on the upper circumferential surface of the circular bottom support, radial reinforcing connecting rods are arranged in a ring of the circular support frame, a shaft hole sleeved on the vertical shaft of the ring of the bottom support is arranged in the circle center of the circular support frame, a thrust bearing sleeved on the vertical shaft is arranged between the circular bottom support and the circular support frame, and traveling wheels are uniformly and circumferentially arranged on the lower circumferential surface of the circular support frame. The portable power line pay-off rack is provided with the circular bottom support and the circular support frame which are matched with each other, is simple in structure and suitable for pay-off construction operation in mountainous areas, rural-urban fringe zones and the like with complicated terrains, and is portable.