Adjustable livestock breeding ventilation equipment

The invention relates to the technical field of breeding ventilation, in particular to adjustable livestock breeding ventilation equipment which comprises a U-shaped pipe with a downward opening, a filtering device is installed at the left end of the U-shaped pipe, an adjusting device is detachably installed at the lower right end of the U-shaped pipe, and an air inlet device is installed at the lower end of the adjusting device. After a fan in the filtering device is started, air in the breeding room can be pumped out through a U-shaped pipe, a cylindrical pipe, a corrugated hose, a communicating pipe and an air inlet frame, a dust collecting bag is placed in a dust collecting barrel, when the air passes through the dust collecting bag, the dust collecting bag collects fine dust in the air, and the air enters a position changing pipe through an air outlet hole; afterwards, the air enters the placing frame through the circular through hole, the activated carbon in the placing frame adsorbs peculiar smell in t