The invention discloses an anti-overflow funnel which comprises a main body, a funnel nozzle and a blocking structure, wherein the blocking structure consists of a check ring, a connection rod and a baffle; the check ring is in a hollow elliptical columnar shape; the baffle is positioned below the check ring and is connected with the check ring through the connection rod. The anti-overflow funnel has the beneficial effects that during the use of the anti-overflow funnel, the lower half parts of the funnel nozzle and the blocking structure are put together into a container subjected to flow guide; when liquid is close to the lower edge of the funnel after being guided to the liquid surface, the connection rod or the check ring is lifted up, so that the funnel nozzle can be blocked through the baffle, and the flowing of the liquid can be stopped; a phenomenon that the liquid overflows can be effectively avoided, and the material loss and the liquid pollution are reduced.