Vacuum pre-compression unit special for soft foundation treatment

The invention discloses a vacuum pre-compression unit special for soft foundation treatment. An oil-water separation filter element (1.1) is inserted in the upper portion of a vacuum tank (1), a lower portion oil outlet of the vacuum tank (1) is communicated to an oil tank (2) through an oil pump (3), an air cooling system (2.1) for cooling the oil tank is arranged beside the oil tank (2), an oil outlet of the oil tank (2) is communicated to a liquid inlet of a vacuum pump (4), a liquid outlet of the vacuum pump (4) is communicated to the upper portion of the vacuum tank (1) through a delivery pipe (6), the end, located in the vacuum tank (1), of the delivery pipe (6) is located above the oil-water separation filter element (1.1), the oil outlet of the oil tank (2) is communicated to the top of the vacuum tank (1) through an oil return pipe (5), and the connecting position of the oil return pipe (5) and the vacuum tank (1) is located at the upper portion of the oil-water separation filter element (1.1). The v