Deposition experimental device and method of small size sand in shaft and pipeline

The invention discloses a deposition experimental device of small size sand in a shaft and a pipeline. The device comprises experimental pipelines, a water storage tank, a metering tank, an air storage tank, a constant liquid level water tank, and a shaft simulator, wherein the experimental pipelines comprise a vertical experimental pipeline and a spiral experimental pipeline, the outlet of the vertical experimental pipeline is communicated with the metering tank through a second pipeline, the outlet of the spiral experimental pipeline is communicated with the metering tank through a third pipeline, the top of the vertical experimental pipeline is provided with a first sand feeding funnel, the first sand feeding funnel is communicated with the vertical experimental pipeline, the top of thespiral experimental pipeline is provided with a second sand feeding funnel, the second sand feeding funnel is communicated with the spiral experimental pipeline, the water storage tank is communicated with the inlet of the s