Stacked turnover brake

The utility model discloses a stacked turnover gate, which is an improvement of a patent '2015204051178-a simple flap gate', and comprises an upper gate and a lower gate which are vertically stacked in a gate chamber, and a water retaining surface is formed by the upper gate and the lower gate. The upper gate is rotationally connected with the lock chamber side wall through an upper rotating shaftand an upper shaft sleeve, and the lower gate is rotationally connected with the lock chamber side wall through a lower rotating shaft and a lower shaft sleeve. The upper rotating shaft and the lowerrotating shaft are both located on one side of the downstream of the gate and fixed to the side wall. A notch is formed in the middle of the gate top of the upper gate. The side wall is provided withan upper limiting block and a lower limiting block which are located on the same horizontal line with the upper rotating shaft and the lower rotating shaft respectively. And water stops are arrangedon the side edges and the bo