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The application relates to a slope protection gradient control device, and relates to the technical field of roadbed slope protection construction.The device comprises an angle steel, which is arranged on an existing retaining wall at the toe of a slope; a telescopic adjusting rod, which is arranged on the angle steel and can rotate in a vertical plane to control the gradient of the slope protection, and the included angle between the adjusting rod and the horizontal direction is equal to the gradient angle of the slope protection; and a slope protection formwork, which is fixed on the slope surface and is used in cooperation with the adjusting rod to limit the pouring range of the slope protection concrete. The device is fixed on the existing retaining wall through the angle steel, the structure of the retaining wall is fully utilized, and no additional supporting structure is needed; the gradient of the slope protection can be accurately controlled through the adjusting rod, the rigidity support of the adjusting rod and the slope protection formwork, and the included angle between the adjusting rod and the horizontal direction can be adjusted according to requirements to accurately control the slope gradient; the overall structure is simple and reliable, the device is convenient to install and disassemble, can be repeatedly used in different engineering projects, and the construction cost is reduced.