Dust collecting box

The utility model provides a dust collecting box. The dust collecting box is characterized in that the lower end of a box body (4) is connected with a dust collecting funnel (7) by an intermediate box (6), a dust collecting manhole (10) is arranged at the bottom part of the dust collecting funnel (7), a cloth bag (3) is movably connected at the inner part of the box body (4), the upper and lower ends of the cloth bag (3) are fixed with a cloth bag air hole (5) by a fixed pipe (1), a manhole door (9) is connected at the lower end at one face of the box body (4), and an exhaust cylinder (2) is connected at the upper end. Therefore, with simple structure and convenient using, the dust collecting box can automatically remove impurities in smoke dust and is particularly suitable for recycling the smoke dust.