An energy-saving cooling system for cooling glass sheets, which is characterized in that the energy-saving cooling system comprises: a motor; an air blower, wherein the air blower is connected on one end to the motor and on the other end to a wind box body; a plurality of slot plates, wherein the slot plates are disposed in the wind box body, an outer surface of the wind box body has a plurality of air outlets, the air outlets are horizontally arranged in an upper row and a lower row, the air outlets in an upper row are arranged respectively opposite to the air outlets in the lower row, each of the air outlets has a wind hole, and the slot plates are respectively disposed in the wind holes; a plurality of driving components, wherein each of the driving components is connected to the corresponding slot plate in the upper row and the corresponding slot plate in the lower row which is arranged opposite to the corresponding slot plate in the upper row, the corresponding two slot plates are controlled by the driving component to pivot to close or open the two corresponding wind holes; a controlling device, wherein the controlling device is connected to the driving components and the motor, the controlling device controls the driving components according to a control signal, and adjusts a rotating speed of the motor according to the control signal, so that the air blower generates corresponding wind power; and a detection device, wherein the detection device is connected to the controlling device, the controlling device generates the control signal according to a position and a dimension of a piece of glass to be cooled down, and the position and the dimension of the piece of the glass to be cooled down are detected by the detection device. a motor; an air blower, wherein the air blower is connected on one end to the motor and on the other end to a wind box body; a plurality of slot plates, wherein the slot plates are disposed in the wind box body, an outer surface of the wind box body has a plurality of air outlets, the air outlets are horizontally arranged in an upper row and a lower row, the air outlets in an upper row are arranged respectively opposite to the air outlets in the lower row, each of the air outlets has a wind hole, and the slot plates are respectively disposed in the wind holes; a plurality of driving components, wherein each of the driving components is connected to the corresponding slot plate in the upper row and the corresponding slot plate in the lower row which is arranged opposite to the corresponding slot plate in the upper row, the corresponding two slot plates are controlled by the driving component to pivot to close or open the two corresponding wind holes; a controlling device, wherein the controlling device is connected to the driving components and the motor, the controlling device controls the driving components according to a control signal, and adjusts a rotating speed of the motor according to the control signal, so that the air blower generates corresponding wind power; and a detection device, wherein the detection device is connected to the controlling device, the controlling device generates the control signal according to a position and a dimension of a piece of glass to be cooled down, and the position and the dimension of the piece of the glass to be cooled down are detected by the detection device.