The invention relates to a hidden building sun-shading shutter leaf system. The system comprises an upright post, shutter leaves, a connection mechanism, a drive mechanism and a pushrod motor, wherein the connection mechanism consists of a shaft lock, a spline shaft and a bearing bush; the drive mechanism consists of a motor drive panel, a drive rod and a connecting rod; the bearing bush is arranged in a shaft hole of the upright post; the shaft lock is inserted into the bearing bush from the outside of the upright post; the spline shaft passes through the connecting rod and the shaft lock from the inside of a main body cavity of the upright post to the outside in turn till the spline shaft is inserted into the shutter leaves; one end of the connecting rod is connected with the drive rod;the drive rod is connected with the motor drive panel; the motor derive panel is connected with the pushrod motor; the bearing bush is taken as a boundary, one part of the shutter leaves is positioned outside the upright post, while the other part is positioned in the upright post; the two parts are connected by the spline shaft and the shaft lock and rotate relative to the bearing bush; and the pushrod motor, the motor drive panel, the drive rod, the connecting rod, the spline shaft and the shutter leaves are linked together to control the opening and closing of the shutter leaves. Only the shutter leaves, the shaft lock and the upright post can be seen from the outside, other components are hidden and protected in the upright post, and the system has a clean and beautiful vertical face.