The invention discloses a simple hydrological wellbore cleaning device comprising a water manifold (1); the upper end of the water manifold (1) is connected with the water drawing pipe (3) in a butt joint mode through a connector (2), and the lower end of the water manifold (1) is provided with a top cover (4) which is fixed on the water manifold (1) in a rotary connecting mode; the bottom of thetop cover (4) is provided with a base (5) which is connected and matched with the top cover (4) in a rotating mode, and a cavity (a) is disposed between the base (5) and the top cover (4); and a plurality of water conducting holes (6) are formed in the base (5) in a ring array mode, the water conducting holes (6) are arranged in an inclined mode, and the upper ends of the water conducting holes (6) communicate with the cavity (a). According to the simple hydrological wellbore cleaning device, the structure is simple, the inner wall of a hydrological wellbore can be flushed through the rotationof the base and mixing blades in the process of pumping water, the overall cleaning effect is greatly improved, and the improvement of the accuracy of the hydrology test is facilitated.