The efficient anti-blocking device comprises a drainage tank, the right side of the drainage tank is fixedly connected with a water tank, the middle end of the right side of the water tank is fixedly provided with a water pump, the input end of the water pump is fixedly connected with a water pumping pipe, the output end of the water pump is fixedly connected with a liquid conveying pipe, and the surface of the liquid conveying pipe is fixedly connected with a flow meter. The inner cavity of the treatment box is fixedly connected with a filtering plate through bolts, the middle end of the filtering plate is fixedly connected with a filtering net, the effect of filtering sundries, leaves and the like is achieved, and therefore blocking can be conducted at the source, a second motor is fixedly installed at the top of the treatment box, and an output shaft of the second motor is in transmission connection with a transmission belt; and the inner surface of the transmission belt is in transmission connection with a transmission disc, and the surface of the transmission disc is fixedly connected with a second crushing cutter, so that the effect of crushing the sundries is achieved, the drainage efficiency can be improved, the sundries are crushed into small blocks, and blockage can be prevented.