The invention discloses a scaffold installed with metal expansion brackets to protect. The scaffold comprises a scaffold body. Two ends of the scaffold body are provided with moving fixed type support frames. The bottoms of the moving fixed type support frames are provided with four universal wheels. The outer side of the universal wheel is provided with a supporting foot. The middle position of the moving fixed type support frame is provided with a pedal body. The pedal body is laterally and horizontally connected between the moving fixed type support frames. The bottom of the pedal body is provided with a fixing plate. Two ends of the fixing plate are provided with metal expansion bracket bodies. One end of the metal expansion bracket body is fixedly connected with the side end face of the fixing plate. The other end of the metal expansion bracket body is guided outwards the outer side of the pedal body. The bottom end of the moving fixed type support frame is horizontally provided with a base. The upper end of the base is fixedly provided with a box. The box is provided with a plurality of drawers. Through the above method, the scaffold can reduce potential risks caused by falling objects in a construction process, and can ensure safety of construction personnel.