The invention discloses a sun-shading vacuum tube flat plate collector, which comprises a box body, a vacuum tube, a condenser and a sun-shading device, wherein the vacuum tube and the condenser are arranged in the box body; the condenser is positioned on the back side of the vacuum tube; a piece of toughened glass is arranged on the front side of the box body; the sun-shading device is arranged in the box body and positioned between the vacuum tube and the toughened glass, and comprises a reducing motor, a rolling blind shaft, a roller and a sun-shading curtain; one end of the sun-shading curtain is fixed on the rolling blind shaft, and a tractive pipe is fixed at the other end of the sun-shading curtain; a guide wheel is fixed at two ends of the tractive pipe respectively; a tractive rope is arranged on the upper side and the lower side in the box body respectively; one end of the tractive rope is fixed on the roller; and the tractive rope is turned after passing through a fixed pulley and the guide wheel on the same side of the tractive rope and then is connected with the tractive rope on the opposite side through a spring. The sun-shading device of the sun-shading vacuum tube flat plate collector is simple in structure, can be rolled smoothly and is difficult to damage.