The invention discloses a fluid-solid coupling model test water level automatic control system which comprises a water level monitor, a controller, a water replenishing device and a real-time display device; the water level monitor, the water replenishing device and the real-time display device are all connected with the controller; the water level monitor comprises a floating scale and a grating scale displacement sensor; the floating scale is connected with the readout end of the grating scale displacement sensor; the readout end is driven to move through scale floating; the pulse signal of the grating scale displacement sensor reflects the height of water level; the controller controls the water replenishing device to adjust the water level by collecting the data signal of the water level monitor. The fluid-solid coupling model test water level automatic control system provided by the invention has the benefits as follows: the system can be used for monitoring, regulating and controlling the water level in real time, so as to ensure the authenticity and the accuracy of testing results; full automation is achieved, and labor input in tests are reduced.
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