Abstract: An auto-focusing device for solar heat energy power generators includes a stationary heating unit for absorbing solar energy to make works, a lens unit including a lens and a frame, a first driving unit connected to the frame and driving the frame, and a tracking unit electrically connected to the first driving unit and controlling the first driving unit to output power. The lens is fixed to the frame and focuses solar beam on the heating unit. The frame is movable along a curved track such that the lens always aims at the sun. Multiple auto-focusing devices for solar heat energy power generators are arranged in matrix form so as to generate electric power.