The invention discloses a UC-type power filter improved structure. The UC-type power filter improved structure comprises a frame base and a magnetic core placed on an inner cavity of the frame base. Copper wires are wound around the magnetic core. Four pins are arranged at the bottom of the frame base. The magnetic core is square. The copper wires are flat. The flat copper wires are connected to two symmetric side columns of the square magnetic core respectively in a wound mode. Winding locating holes facilitating automatic winding are formed in the positions, at the centers of the side columns, of the upper end face of the magnetic core. Small cylinders are arranged on the side wall of the inner cavity of the frame base and connected into the winding locating holes in a clamped mode. The lower end face of the magnetic core is provided with a directional groove. A directional protruding part matched with the directional groove is arranged on the side wall of the inner cavity of the frame base. Heat dissipation holes are formed in the periphery of the side wall of the inner cavity of the frame base. The directional groove is trapezoidal or triangular. The winding locating holes are rectangular. The UC-type power filter improved structure is low in manufacturing cost and good in EMI resistance and shielding effect.