An aquatic cultivation system includes a bowl and a siphon equipment. The bowl contains a liquid. The siphon equipment includes a liquid intake tube, and a liquid exit tube. At least one of the liquid tube and the liquid exit tube includes an air vent. The siphon equipment includes a water level control element corresponding to the air vent. The water level control element includes a connection portion and a brake portion located on the connection portion. The brake portion is movable on a reciprocal movement locus when subject to change of liquid water level elevation to close or release the air vent, thereby drives the siphon equipment to draw intermittently the liquid in the bowl. As a result, filths in the bowl can be removed and an intermittent turbulent current can be generated to prevent the filths from depositing at the bottom of the bowl.
