The invention discloses a hydrodynamic filter for micro-irrigation. The hydrodynamic filter comprises a central transmission shaft, one end of the central transmission shaft is fixedly provided with a transmission part used for driving the central transmission shaft to rotate, and the other end of the central transmission shaft penetrates into a filtering and cleaning part and is fixedly connected with the filtering and cleaning part. A power assembly of the filter can utilize water flow to provide rotating power, so that a reliable source of the power is ensured, and energy is saved; meanwhile, the filter is based on the Archimedes spiral theorem, and impurities are pushed towards the water outlet direction along the central transmission shaft through a spiral brush and then discharged out of the filter; and meanwhile, water flow and impurities are separated through a filter assembly, and the impurities are separated in a filter screen to ensure effective filtration, so that the device has the advantages of few accessories, small abrasion, durability, low manufacturing cost, convenience in operation and management, difficulty in blockage, energy conservation, emission reduction, rapidness and high efficiency.