The present invention provides a solar photovoltaic rotation device installed the top of a pole so as to rotate a solar panel array, the device comprising: a first tubular body; a second tubular body; a gear unit; and a driving motor, wherein the gear unit is formed as a planet gear set comprising: a sun gear connected to a rotational shaft of the driving motor; multiple PL gears disposed around the sun gear to be engaged with the sun gear; and a ring gear disposed outside of the multiple PL gears to be engaged with the PL gears, the ring gear being fixed to the first tubular body, and at least one among the sun gear, the PL gears, and the ring gear has inclined teeth formed on the circumferential surface thereof, and thus has a tapered structure.