The utility model discloses an anti-blocking funnel which comprises a funnel upper-opening part and a funnel tube part, wherein a vent channel is arranged on the funnel and comprises flanges longitudinally arranged outside the funnel from the funnel upper-opening part to the funnel tube part; when the funnel is used, the funnel tube part extends into a container opening, the protruded flanges are clamped in the container opening, two sides of the flanges form gas channels with the container opening respectively; cross sections of the flanges are triangular, square or trapezoidal. When the anti-blocking funnel is used for filling, the requirement of quickly filling liquid can be met without effusion phenomenon; the anti-blocking funnel further effectively solves the problem that a container is unlikely to be filled when the liquid in the container submerges the funnel tube bottom.