The invention discloses a device for measuring the natural repose angle of powder coarse-grained soil. The device comprises a soil accommodating container, an upper soil receiving plate and a lower soil receiving plate in turn from top to bottom, wherein the bottom of the soil accommodating container is provided with a valve I and a valve II; the open area of the valve I and the valve II is smaller than 1/2 of the floor space of the soil accommodating container; the upper soil receiving plate is opposite to the valve I and is staggered from the valve II; and the lower soil receiving plate is opposite to the valve II. During use, powder to be measured is put into the soil accommodating container, the powder in the soil accommodating container is flattened, the corresponding valve is openedto make the powder freely fall onto a corresponding bottom plate if the natural repose angle at one height is singly measured, the two valves are opened simultaneously to make the powder freely fall onto upper and lower bottom plates if the natural repose angles of the powder at two heights are measured simultaneously, and the required natural repose angle of the powder is measured after the powder is stably caved.