Filter system suitable for water removal, impurity removal and recovery of oil product

The invention relates to a filter system, and concretely relates to a filter system suitable for water removal, impurity removal and recovery of an oil product. The system comprises a filter A (1), a filter B (2), a pressure reducing valve (3), an inlet channel (4), an outlet channel (6), a filter C (8), an oil product recovery pump (9), an oil product recovery tank (10), a filter D (14), a water removal tank (15), an oil product analyzer (16), a recovery channel (18), a low pressure channel (19) and a high pressure channel (20) are connected. Four filters and the water removal tank are arranged on a channel between the high pressure channel and the oil product analyzer, the oil product recovery tank and the oil product recovery pump are arranged between the oil product analyzer and the low pressure channel, and a plurality of needle valves are arranged on the inlet and outlet channels of the oil product analyzer, so the online oil product analyzer is protected from being damaged by impurities, and the service life of the online oil product analyzer is prolonged.