The invention discloses a photovoltaic power generation device capable of performing automatic tracking, which comprises a base. The top part of the base is provided with a sliding groove; the inner wall of the sliding groove is movably connected with a sliding block; the top part of the sliding block is fixedly connected with a supporting column; and the top part, corresponding to the opening ofthe sliding groove, of the base is fixedly connected with a rack ring. Through mutual match among the sliding block, the supporting column, the rack ring, a supporting plate, a driving motor, a driving rotation shaft, a gear, a shelving plate, a supporting sliding column, a sliding sleeve, an electric pushing rod, a first connecting plate, a first connecting shaft, a second connecting shaft, a second connecting plate, a mounting plate, a solar panel, a third connecting plate and a third connecting shaft, the photovoltaic power generation device can automatically track light, the best sunward position is achieved, enough sunlight is obtained, the utilization rate of solar energy is improved, and photovoltaic power generation effects are more ideal.