The invention discloses a testing device for simulating field underground water level control. The device comprises a testing column, breather pipes, a liquid receiving bottle and a Markov bottle. An inner cavity of the testing column is filled with a soil layer. The soil layer selects undisturbed soil of an experimental field, and layering filling is performed according to different-layer layering soil sampling; the Markov bottle is connected to the position, paved with a silica sand layer, of the testing column through a pipeline; the horizontal breather pipes are arranged inside the testing column in a penetrating mode along the vertical height every 15 cm, and the two ends of the breather pipes stretch out of the testing column; one end of each breather pipe is a gas inlet, the other end of each breather pipe is a liquid outlet, and upward vent holes are formed in the portions, inside the testing column, of the breather pipes. The testing device is simple in structure and novel in concept, undistributed soil of the experimental field is compacted inside one PVC pipe in a layered mode, the true situation of the soil layer needed by tests can be accurately simulated, accurate testing data is obtained, and the basis is provided for obtaining related parameters and patent application for large-scale earth pillar field tests.