The invention discloses a poromeric draining pipe type reducing furnace, which comprises the following parts: boating-pushing device (1), firedoor (2), exhaust ignition or recovery pipe (3), poromeric boat-container (4), nanometer tungsten oxide powder (5), boat-container poromeric floor (6), furnace tube (7), positive pressure H 2 supply porous air-cushion (8), heating plate (9), drainage air-flow channel (10), furnace case (11), cold water case (12), positive pressure air-supply system (13) and furnace rack (14), wherein the positive pressure H 2 supply porous air-cushion (8) is set on the bottom of furnace tube (7); the H 2 even pressure chamber is formed between the double-layer boat-container poromeric plate (6) and porous air-cushion (8), which pierces the boat-container poromeric floor (6) after buffering. The average grain size of nanometer tungsten powder is or less than 35.5 nm with the distribution breadth ranged from 45 to 50 nm.