A filtration and air supply device(3) used in an aquatic equipment(2) ,comprising filtration system with air supply, including filtration box(31), water pump(33), filter cartridge(32), air pump(7), air inlet tube(8), air duct(36). The characteristics of this filtration and air supply device(3) are: Said filtration and air supply device(3) locates inside the aquatic equipment(2). Box wall(310) is with grids(312). Water pump(33) locates in one side of the filtration box(31), and filter cartridge(32) locates in the other side of the filtration box(31). Bottom slab(9) is equipped with air inlet hole(38) and water pump power cord inlet hole(40). The bottom of air inlet hole(38) connects the air pump(7) through air inlet tube(8). The upper part of air inlet hole(38) connects air outlet hole (318) through air duct(36). No-return valve(37) locates between air duct(36) and air outlet hole(318). Outside of the air outlet hole(318) is equipped with air filter hood(315).
