Boiler flue gas multi-layer filtering device

The utility model provides a multi-layer filtering device for boiler flue gas, which relates to the technical field of flue gas filtering and comprises a smoke discharging cylinder. The smoke contains impurities, at the moment, the first filter box is shielded, and then the filtering effect of the first filter box is influenced, at the moment, the first filter box needs to be cleaned, an auxiliary arm is pushed and pulled in a reciprocating mode during cleaning, when the auxiliary arm is pushed and pulled in a reciprocating mode, the auxiliary arm is continuously clamped with a protrusion, and at the moment, the first filter box is in a continuous vibration state; impurities can be shaken off through continuous vibration of the first filtering box, the cleaning interval is prolonged, multiple filtering can be achieved, impurities can be conveniently cleaned, and the problem that the filtering effect of a filtering piece is affected when some impurities are contained in smoke after filtering is conducted for a