The invention relates to the field of the solar photovoltaic power generation technology, in particular to a sun tracking device for a solar panel. The sun tracking device comprises a box body; a first accommodation cavity is formed inside the box body; a fixation plate for installing a solar panel is arranged in the first accommodation cavity; an elevation adjusting device and a driving device are arranged at the bottom of the fixation plate; the fixation plate and the elevation adjusting device are fixedly connected; and the elevation adjusting device is arranged at the top of the driving device. A lifting device is arranged on the outer side wall of the box body at the upper section of the box body and consists of a first lifting assembly and a second lifting assembly that cooperate with the driving device. According to the invention, a driving gear is driven to make rotation by a gear rotation motor and thus a driven gear, the rotating shaft, a turntable, and the elevation adjusting device fixed at the turntable are driven to make rotation, so that the solar panel fixed on the fixation plate rotates with rotation of the sun.