Tail gas absorption anti-suck-back device

The utility model relates to the technical field of tail gas absorption, and discloses a tail gas absorption anti-suck-back device which comprises a connecting tail gas pipe, the lower end of the connecting tail gas pipe is communicated with a porous round pipe and an inverted shell, the porous round pipe is arranged in an inner cavity of the inverted shell and floats on the liquid level of a solvent through a floating ball, and then the floating ball blocks the tail gas connecting pipe. When tail gas in the tail gas connecting pipe is pressurized, the floating ball abuts out of the tail gas connecting pipe, then the intensity of pressure in the back-off shell which is back-off on the liquid level of a solvent is increased, the tail gas is dissolved in the solvent, and when the tail gas is insufficient, the liquid level in the back-off shell rises, and then the floating ball is driven to plug the lower end of the tail gas connecting pipe. The solvent is prevented from being sucked back into the tail gas conne