The invention relates to a passive type dynamic levelling control system of a hydraulic machine. The system comprises a controller, a constant-pressure oil source P1, a high-pressure oil source P2, an oil tank, a first displacement sensor, a second displacement sensor, a third displacement sensor, a fourth displacement sensor, a first dynamic levelling hydraulic sub-system S1, a second dynamic levelling hydraulic sub-system S2, a third dynamic levelling hydraulic sub-system S3, and a fourth dynamic levelling hydraulic sub-system S4, wherein each of the first, the second, the third and the fourth dynamic levelling hydraulic sub-systems is composed of a first check valve, a first, a second and a third electromagnetic ball valves, and a first, a second and a third levelling overflow valves; the oil inlets of the first, the second and the third electromagnetic ball valves are communicated with each other and connected with a rodless cavity of a first levelling hydraulic cylinder; the oil outlets of the first, the second and the third electromagnetic ball valves are respectively connected with the oil inlets of the first, the second and the third levelling overflow valves; and the oil outlets of the first, the second and the third leveling overflow valves are communicated with each other and connected back to the oil tank. The passive type dynamic levelling control system provided by the invention has the advantages that the antijamming capability is high and the stability is high.