Natural intake type foam generator

The invention discloses a natural intake type foam generator. The natural intake type foam generator comprises a mother pipe, an intake cover, a separation cover, a first bracket, a second bracket, an impeller set, a turbine set, a main shaft, a guider, a fairing cone and a fairing cover, wherein the intake cover and the fairing cover are respectively mounted at the two ends of the mother pipe; the first bracket is mounted in an inner hole of one end, close to the intake cover, of the mother pipe; the second bracket is mounted in an inner hole of one end, close to the fairing cover, of the mother pipe; the fairing cone is mounted on the second bracket; the two ends of the main shaft are respectively combined with bearings mounted on the first bracket and the fairing cone; the separation cover is mounted in the inner hole of the end, close to the intake cover, of the mother pipe; an inner hole of a cone frustum type cylinder of the separation cover is an air storage chamber; the outer wall of the cone frustum type cylinder, the annular surface of an annular piece of the separation cove and the inner wall of the mother pipe define a liquid storage chamber; a liquid inlet is formed in the wall of the mother pipe in the liquid storage chamber; a liquid spraying hole is formed in the annular surface; the impeller set is mounted on the main shaft, and is positioned in the air storage chamber; the guider is mounted on the main shaft, and is positioned between the annular piece of the separation cover and the fairing cone; and the turbine set is mounted on the guider.