The invention provides a ventilation type nozzle which is characterized in that the ventilation type nozzle includes a nozzle main body, a water intake port, a high pressure water jet hole, a variable pressure bell mouth and a vent hole; wherein, the water intake port is positioned at the center of one end of the nozzle main body and is dented into the central part of the nozzle main body; the high pressure water jet hole is communicated with the water intake port and extends along the axial direction of the nozzle main body; the variable pressure bell mouth is positioned at the other end of the nozzle main body and communicated with the high pressure water jet hole, and the radical size of the variable pressure bell mouth is gradually reduced when variable pressure bell mouth approaches the high pressure water jet hole and is equal to the size of the high pressure water jet hole at last; the vent hole communicates the inner side and the outer side of the variable pressure bell mouth.